text: #include "avmplus.h"
  
  /*************************************************
  *      Perl-Compatible Regular Expressions       *
  *************************************************/
  
  /* PCRE is a library of functions to support regular expressions whose syntax
  and semantics are as close as possible to those of the Perl 5 language.
  
                         Written by Philip Hazel
             Copyright (c) 1997-2007 University of Cambridge
  
  -----------------------------------------------------------------------------
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
  
      * Redistributions of source code must retain the above copyright notice,
        this list of conditions and the following disclaimer.
  
      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
  
      * Neither the name of the University of Cambridge nor the names of its
        contributors may be used to endorse or promote products derived from
        this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.
  -----------------------------------------------------------------------------
  */
  
  
  /* This module contains pcre_exec(), the externally visible function that does
  pattern matching using an NFA algorithm, trying to mimic Perl as closely as
  possible. There are also some static supporting functions. */
  
  #include "config.h"
  
  #define NLBLOCK md             /* Block containing newline information */
  #define PSSTART start_subject  /* Field containing processed string start */
  #define PSEND   end_subject    /* Field containing processed string end */
  
  #include "pcre_internal.h"
  
  // CN:  Mods to pcre to make it ECMAScript edition 3 compatible are enabled when this global
  //  is set to true
  static const bool ES3_Compatible_Behavior = true;
  
  /* Undefine some potentially clashing cpp symbols */
  
  #undef min
  #undef max
  
  /* Flag bits for the match() function */
  
  #define match_condassert     0x01  /* Called to check a condition assertion */
  #define match_cbegroup       0x02  /* Could-be-empty unlimited repeat group */
  
  /* Non-error returns from the match() function. Error returns are externally
  defined PCRE_ERROR_xxx codes, which are all negative. */
  
  #define MATCH_MATCH        1
  #define MATCH_NOMATCH      0
  
  /* Special internal returns from the match() function. Make them sufficiently
  negative to avoid the external error codes. */
  
  #define MATCH_COMMIT       (-999)
  #define MATCH_PRUNE        (-998)
  #define MATCH_SKIP         (-997)
  #define MATCH_THEN         (-996)
  
  /* Maximum number of ints of offset to save on the stack for recursive calls.
  If the offset vector is bigger, malloc is used. This should be a multiple of 3,
  because the offset vector is always a multiple of 3 long. */
  
  #define REC_STACK_SAVE_MAX 30
  
  /* Min and max values for the common repeats; for the maxima, 0 => infinity */
  
  static const char rep_min[] = { 0, 0, 1, 1, 0, 0 };
  static const char rep_max[] = { 0, 0, 0, 0, 1, 1 };
  
  
  
  #ifdef PCRE_DEBUG
  /*************************************************
  *        Debugging function to print chars       *
  *************************************************/
  
  /* Print a sequence of chars in printable format, stopping at the end of the
  subject if the requested.
  
  Arguments:
    p           points to characters
    length      number to print
    is_subject  TRUE if printing from within md->start_subject
    md          pointer to matching data block, if is_subject is TRUE
  
  Returns:     nothing
  */
  
  static void
  pchars(const uschar *p, int length, BOOL is_subject, match_data *md)
  {
  unsigned int c;
  if (is_subject && length > md->end_subject - p) length = md->end_subject - p;
  while (length-- > 0)
    if (VMPI_isprint(c = *(p++))) printf("%c", c); else printf("\\x%02x", c);
  }
  #endif
  
  
  
  /*************************************************
  *          Match a back-reference                *
  *************************************************/
  
  /* If a back reference hasn't been set, the length that is passed is greater
  than the number of characters left in the string, so the match fails.
  
  Arguments:
    offset      index into the offset vector
    eptr        points into the subject
    length      length to be matched
    md          points to match data block
    ims         the ims flags
  
  Returns:      TRUE if matched
  */
  
  static BOOL
  match_ref(int offset, register USPTR eptr, int length, match_data *md,
    unsigned long int ims)
  {
  if (ES3_Compatible_Behavior)
  {
  	if (md->offset_vector[offset] == -1) // for ECMAScript compliance, undefined group references are always true
  		return true; // though they match 0 characters.
  }
  USPTR p = md->start_subject + md->offset_vector[offset];
  
  #ifdef PCRE_DEBUG
  if (eptr >= md->end_subject)
    printf("matching subject <null>");
  else
    {
    printf("matching subject ");
    pchars(eptr, length, TRUE, md);
    }
  printf(" against backref ");
  pchars(p, length, FALSE, md);
  printf("\n");
  #endif
  
  /* Always fail if not enough characters left */
  
  if (length > md->end_subject - eptr) return FALSE;
  
  /* Separate the caselesss case for speed */
  
  if ((ims & PCRE_CASELESS) != 0)
    {
    while (length-- > 0)
      if (md->lcc[*p++] != md->lcc[*eptr++]) return FALSE;
    }
  else
    { while (length-- > 0) if (*p++ != *eptr++) return FALSE; }
  
  return TRUE;
  }
  
  
  
  /***************************************************************************
  ****************************************************************************
                     RECURSION IN THE match() FUNCTION
  
  The match() function is highly recursive, though not every recursive call
  increases the recursive depth. Nevertheless, some regular expressions can cause
  it to recurse to a great depth. I was writing for Unix, so I just let it call
  itself recursively. This uses the stack for saving everything that has to be
  saved for a recursive call. On Unix, the stack can be large, and this works
  fine.
  
  It turns out that on some non-Unix-like systems there are problems with
  programs that use a lot of stack. (This despite the fact that every last chip
  has oodles of memory these days, and techniques for extending the stack have
  been known for decades.) So....
  
  There is a fudge, triggered by defining NO_RECURSE, which avoids recursive
  calls by keeping local variables that need to be preserved in blocks of memory
  obtained from malloc() instead instead of on the stack. Macros are used to
  achieve this so that the actual code doesn't look very different to what it
  always used to.
  
  The original heap-recursive code used longjmp(). However, it seems that this
  can be very slow on some operating systems. Following a suggestion from Stan
  Switzer, the use of longjmp() has been abolished, at the cost of having to
  provide a unique number for each call to RMATCH. There is no way of generating
  a sequence of numbers at compile time in C. I have given them names, to make
  them stand out more clearly.
  
  Crude tests on x86 Linux show a small speedup of around 5-8%. However, on
  FreeBSD, avoiding longjmp() more than halves the time taken to run the standard
  tests. Furthermore, not using longjmp() means that local dynamic variables
  don't have indeterminate values; this has meant that the frame size can be
  reduced because the result can be "passed back" by straight setting of the
  variable instead of being passed in the frame.
  ****************************************************************************
  ***************************************************************************/
  
  /* Numbers for RMATCH calls. When this list is changed, the code at HEAP_RETURN
  below must be updated in sync.  */
  
  enum { RM1=1, RM2,  RM3,  RM4,  RM5,  RM6,  RM7,  RM8,  RM9,  RM10,
         RM11,  RM12, RM13, RM14, RM15, RM16, RM17, RM18, RM19, RM20,
         RM21,  RM22, RM23, RM24, RM25, RM26, RM27, RM28, RM29, RM30,
         RM31,  RM32, RM33, RM34, RM35, RM36, RM37, RM38, RM39, RM40,
         RM41,  RM42, RM43, RM44, RM45, RM46, RM47, RM48, RM49, RM50,
         RM51,  RM52, RM53, RM54 };
  
  /* These versions of the macros use the stack, as normal. There are debugging
  versions and production versions. Note that the "rw" argument of RMATCH isn't
  actuall used in this definition. */
  
  #ifndef NO_RECURSE
  #define REGISTER register
  
  #ifdef PCRE_DEBUG
  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw) \
    { \
    printf("match() called in line %d\n", __LINE__); \
    rrc = match(ra,rb,mstart,rc,rd,re,rf,rg,rdepth+1); \
    printf("to line %d\n", __LINE__); \
    }
  #define RRETURN(ra) \
    { \
    printf("match() returned %d from line %d ", ra, __LINE__); \
    return ra; \
    }
  #else
  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw) \
    rrc = match(ra,rb,mstart,rc,rd,re,rf,rg,rdepth+1)
  #define RRETURN(ra) return ra
  #endif
  
  #else
  
  
  /* These versions of the macros manage a private stack on the heap. Note that
  the "rd" argument of RMATCH isn't actually used in this definition. It's the md
  argument of match(), which never changes. */
  
  #define REGISTER
  
  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw)\
    {\
    {heapframe *newframe = alloc_frame();\
    frame->Xwhere = rw; \
    newframe->Xeptr = ra;\
    newframe->Xecode = rb;\
    newframe->Xmstart = mstart;\
    newframe->Xoffset_top = rc;\
    newframe->Xims = re;\
    newframe->Xeptrb = rf;\
    newframe->Xflags = rg;\
    newframe->Xrdepth = frame->Xrdepth + 1;\
    newframe->Xprevframe = frame;\
    frame = newframe;\
    }\
    DPRINTF(("restarting from line %d\n", __LINE__));\
    goto HEAP_RECURSE;\
    L_##rw:\
    DPRINTF(("jumped back to line %d\n", __LINE__));\
    }
  
  #define RRETURN(ra)\
    {\
    {heapframe *frame_to_free = frame;\
    frame = frame_to_free->Xprevframe;\
    free_frame(frame_to_free);\
    }\
    if (frame != NULL)\
      {\
      rrc = ra;\
      goto HEAP_RETURN;\
      }\
    return ra;\
    }
  
  
  /* Structure for remembering the local variables in a private frame */
  
  typedef struct heapframe {
    struct heapframe *Xprevframe;
  
    /* Function arguments that may change */
  
    const uschar *Xeptr;
    const uschar *Xecode;
    const uschar *Xmstart;
    int Xoffset_top;
    long int Xims;
    eptrblock *Xeptrb;
    int Xflags;
    unsigned int Xrdepth;
  
    /* Function local variables */
  
    const uschar *Xcallpat;
    const uschar *Xcharptr;
    const uschar *Xdata;
    const uschar *Xnext;
    const uschar *Xpp;
    const uschar *Xprev;
    const uschar *Xsaved_eptr;
  
    recursion_info Xnew_recursive;
  
    BOOL Xcur_is_word;
    BOOL Xcondition;
    BOOL Xprev_is_word;
  
    unsigned long int Xoriginal_ims;
  
  #ifdef SUPPORT_UCP
    int Xprop_type;
    int Xprop_value;
    int Xprop_fail_result;
    int Xprop_category;
    int Xprop_chartype;
    int Xprop_script;
    int Xoclength;
    uschar Xocchars[8];
  #endif
  
    int Xctype;
    unsigned int Xfc;
    int Xfi;
    int Xlength;
    int Xmax;
    int Xmin;
    int Xnumber;
    int Xoffset;
    int Xop;
    int Xsave_capture_last;
    int Xsave_offset1, Xsave_offset2, Xsave_offset3;
    int Xstacksave[REC_STACK_SAVE_MAX];
    int* XoffsetStackSave;
    int XoffsetStackSaveMax;
    int XoffsetStackSaveStg[REC_STACK_SAVE_MAX];
    int XsavedElems;  
  
    eptrblock Xnewptrb;
  
    /* Where to jump back to */
  
    int Xwhere;
  } heapframe;
  
  static heapframe* alloc_frame()
  {
      heapframe* hf = (heapframe*)(pcre_stack_malloc)(sizeof(heapframe));
      hf->XoffsetStackSave = hf->XoffsetStackSaveStg;
      hf->XoffsetStackSaveMax = REC_STACK_SAVE_MAX;
      return hf;
  }
  static void free_frame(heapframe* hf)
  {
      if (hf->XoffsetStackSave != hf->XoffsetStackSaveStg)
      {
          (pcre_free)(hf->XoffsetStackSave);
          AvmAssert(hf->XoffsetStackSaveMax > REC_STACK_SAVE_MAX);
      }
      else
      {
          AvmAssert(hf->XoffsetStackSaveMax == REC_STACK_SAVE_MAX);
      }
      (pcre_stack_free)(hf);
  }
  
  #endif
  
  
  /***************************************************************************
  ***************************************************************************/
  
  
  
  /*************************************************
  *         Match from current position            *
  *************************************************/
  
  /* This function is called recursively in many circumstances. Whenever it
  returns a negative (error) response, the outer incarnation must also return the
  same response.
  
  Performance note: It might be tempting to extract commonly used fields from the
  md structure (e.g. utf8, end_subject) into individual variables to improve
  performance. Tests using gcc on a SPARC disproved this; in the first case, it
  made performance worse.
  
  Arguments:
     eptr        pointer to current character in subject
     ecode       pointer to current position in compiled code
     mstart      pointer to the current match start position (can be modified
                   by encountering \K)
     offset_top  current top pointer
     md          pointer to "static" info for the match
     ims         current /i, /m, and /s options
     eptrb       pointer to chain of blocks containing eptr at start of
                   brackets - for testing for empty matches
     flags       can contain
                   match_condassert - this is an assertion condition
                   match_cbegroup - this is the start of an unlimited repeat
                     group that can match an empty string
     rdepth      the recursion depth
  
  Returns:       MATCH_MATCH if matched            )  these values are >= 0
                 MATCH_NOMATCH if failed to match  )
                 a negative PCRE_ERROR_xxx value if aborted by an error condition
                   (e.g. stopped by repeated call or recursion limit)
  */
  
  static int
  match(REGISTER USPTR eptr, REGISTER const uschar *ecode, const uschar *mstart,
    int offset_top, match_data *md, unsigned long int ims, eptrblock *eptrb,
    int flags, unsigned int rdepth)
  {
  /* These variables do not need to be preserved over recursion in this function,
  so they can be ordinary variables in all cases. Mark some of them with
  "register" because they are used a lot in loops. */
  
  register int  rrc;         /* Returns from recursive calls */
  register int  i;           /* Used for loops not involving calls to RMATCH() */
  register unsigned int c;   /* Character values not kept over RMATCH() calls */
  register BOOL utf8;        /* Local copy of UTF-8 flag for speed */
  
  BOOL minimize, possessive; /* Quantifier options */
  
  /* When recursion is not being used, all "local" variables that have to be
  preserved over calls to RMATCH() are part of a "frame" which is obtained from
  heap storage. Set up the top-level frame here; others are obtained from the
  heap whenever RMATCH() does a "recursion". See the macro definitions above. */
  
  #ifdef NO_RECURSE
  heapframe *frame = alloc_frame();
  frame->Xprevframe = NULL;            /* Marks the top level */
  
  /* Copy in the original argument variables */
  
  frame->Xeptr = eptr;
  frame->Xecode = ecode;
  frame->Xmstart = mstart;
  frame->Xoffset_top = offset_top;
  frame->Xims = ims;
  frame->Xeptrb = eptrb;
  frame->Xflags = flags;
  frame->Xrdepth = rdepth;
  
  /* This is where control jumps back to to effect "recursion" */
  
  HEAP_RECURSE:
  
  /* Macros make the argument variables come from the current frame */
  
  #define eptr               frame->Xeptr
  #define ecode              frame->Xecode
  #define mstart             frame->Xmstart
  #define offset_top         frame->Xoffset_top
  #define ims                frame->Xims
  #define eptrb              frame->Xeptrb
  #define flags              frame->Xflags
  #define rdepth             frame->Xrdepth
  
  /* Ditto for the local variables */
  
  #ifdef SUPPORT_UTF8
  #define charptr            frame->Xcharptr
  #endif
  #define callpat            frame->Xcallpat
  #define data               frame->Xdata
  #define next               frame->Xnext
  #define pp                 frame->Xpp
  #define prev               frame->Xprev
  #define saved_eptr         frame->Xsaved_eptr
  
  #define new_recursive      frame->Xnew_recursive
  
  #define cur_is_word        frame->Xcur_is_word
  #define condition          frame->Xcondition
  #define prev_is_word       frame->Xprev_is_word
  
  #define original_ims       frame->Xoriginal_ims
  
  #ifdef SUPPORT_UCP
  #define prop_type          frame->Xprop_type
  #define prop_value         frame->Xprop_value
  #define prop_fail_result   frame->Xprop_fail_result
  #define prop_category      frame->Xprop_category
  #define prop_chartype      frame->Xprop_chartype
  #define prop_script        frame->Xprop_script
  #define oclength           frame->Xoclength
  #define occhars            frame->Xocchars
  #endif
  
  #define ctype              frame->Xctype
  #define fc                 frame->Xfc
  #define fi                 frame->Xfi
  #define length             frame->Xlength
  #define max                frame->Xmax
  #define min                frame->Xmin
  #define number             frame->Xnumber
  #define offset             frame->Xoffset
  #define op                 frame->Xop
  #define save_capture_last  frame->Xsave_capture_last
  #define save_offset1       frame->Xsave_offset1
  #define save_offset2       frame->Xsave_offset2
  #define save_offset3       frame->Xsave_offset3
  #define savedElems         frame->XsavedElems
  #define stacksave          frame->Xstacksave
  #define offsetStackSave    frame->XoffsetStackSave
  
  #define newptrb            frame->Xnewptrb
  
  /* When recursion is being used, local variables are allocated on the stack and
  get preserved during recursion in the normal way. In this environment, fi and
  i, and fc and c, can be the same variables. */
  
  #else         /* NO_RECURSE not defined */
  #define fi i
  #define fc c
  
  
  #ifdef SUPPORT_UTF8                /* Many of these variables are used only  */
  const uschar *charptr;             /* in small blocks of the code. My normal */
  #endif                             /* style of coding would have declared    */
  const uschar *callpat;             /* them within each of those blocks.      */
  const uschar *data;                /* However, in order to accommodate the   */
  const uschar *next;                /* version of this code that uses an      */
  USPTR         pp;                  /* external "stack" implemented on the    */
  const uschar *prev;                /* heap, it is easier to declare them all */
  USPTR         saved_eptr;          /* here, so the declarations can be cut   */
                                     /* out in a block. The only declarations  */
  recursion_info new_recursive;      /* within blocks below are for variables  */
                                     /* that do not have to be preserved over  */
  BOOL cur_is_word;                  /* a recursive call to RMATCH().          */
  BOOL condition;
  BOOL prev_is_word;
  
  unsigned long int original_ims;
  
  #ifdef SUPPORT_UCP
  int prop_type;
  int prop_value;
  int prop_fail_result;
  int prop_category;
  int prop_chartype;
  int prop_script;
  int oclength;
  uschar occhars[8];
  #endif
  
  int ctype;
  int length;
  int max;
  int min;
  int number;
  int offset;
  int op;
  int save_capture_last;
  int save_offset1, save_offset2, save_offset3;
  int stacksave[REC_STACK_SAVE_MAX];
  int offsetStackSave[REC_STACK_SAVE_MAX];
  int savedElems;
  
  eptrblock newptrb;
  #endif     /* NO_RECURSE */
  
  /* These statements are here to stop the compiler complaining about unitialized
  variables. */
  
  #ifdef SUPPORT_UCP
  prop_value = 0;
  prop_fail_result = 0;
  #endif
  
  
  /* This label is used for tail recursion, which is used in a few cases even
  when NO_RECURSE is not defined, in order to reduce the amount of stack that is
  used. Thanks to Ian Taylor for noticing this possibility and sending the
  original patch. */
  
  TAIL_RECURSE:
  
  /* OK, now we can get on with the real code of the function. Recursive calls
  are specified by the macro RMATCH and RRETURN is used to return. When
  NO_RECURSE is *not* defined, these just turn into a recursive call to match()
  and a "return", respectively (possibly with some debugging if DEBUG is
  defined). However, RMATCH isn't like a function call because it's quite a
  complicated macro. It has to be used in one particular way. This shouldn't,
  however, impact performance when true recursion is being used. */
  
  #ifdef SUPPORT_UTF8
  utf8 = md->utf8;       /* Local copy of the flag */
  #else
  utf8 = FALSE;
  #endif
  
  /* First check that we haven't called match() too many times, or that we
  haven't exceeded the recursive call limit. */
  
  if (md->match_call_count++ >= md->match_limit) RRETURN(PCRE_ERROR_MATCHLIMIT);
  if (rdepth >= md->match_limit_recursion) RRETURN(PCRE_ERROR_RECURSIONLIMIT);
  
  original_ims = ims;    /* Save for resetting on ')' */
  
  /* At the start of a group with an unlimited repeat that may match an empty
  string, the match_cbegroup flag is set. When this is the case, add the current
  subject pointer to the chain of such remembered pointers, to be checked when we
  hit the closing ket, in order to break infinite loops that match no characters.
  When match() is called in other circumstances, don't add to the chain. The
  match_cbegroup flag must NOT be used with tail recursion, because the memory
  block that is used is on the stack, so a new one may be required for each
  match(). */
  
  if ((flags & match_cbegroup) != 0)
    {
    newptrb.epb_saved_eptr = eptr;
    newptrb.epb_prev = eptrb;
    eptrb = &newptrb;
    }
  
  /* Now start processing the opcodes. */
  
  for (;;)
    {
    minimize = possessive = FALSE;
    op = *ecode;
  
    /* For partial matching, remember if we ever hit the end of the subject after
    matching at least one subject character. */
  
    if (md->partial &&
        eptr >= md->end_subject &&
        eptr > mstart)
      md->hitend = TRUE;
  
    switch(op)
      {
      case OP_FAIL:
      RRETURN(MATCH_NOMATCH);
  
      case OP_PRUNE:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
        ims, eptrb, flags, RM51);
      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
      RRETURN(MATCH_PRUNE);
  
      case OP_COMMIT:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
        ims, eptrb, flags, RM52);
      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
      RRETURN(MATCH_COMMIT);
  
      case OP_SKIP:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
        ims, eptrb, flags, RM53);
      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
      md->start_match_ptr = eptr;   /* Pass back current position */
      RRETURN(MATCH_SKIP);
  
      case OP_THEN:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
        ims, eptrb, flags, RM54);
      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
      RRETURN(MATCH_THEN);
  
      /* Handle a capturing bracket. If there is space in the offset vector, save
      the current subject position in the working slot at the top of the vector.
      We mustn't change the current values of the data slot, because they may be
      set from a previous iteration of this group, and be referred to by a
      reference inside the group.
  
      If the bracket fails to match, we need to restore this value and also the
      values of the final offsets, in case they were set by a previous iteration
      of the same bracket.
  
      If there isn't enough space in the offset vector, treat this as if it were
      a non-capturing bracket. Don't worry about setting the flag for the error
      case here; that is handled in the code for KET. */
  
      case OP_CBRA:
      case OP_SCBRA:
      number = GET2(ecode, 1+LINK_SIZE);
      offset = number << 1;
  
  #ifdef PCRE_DEBUG
      printf("start bracket %d\n", number);
      printf("subject=");
      pchars(eptr, 16, TRUE, md);
      printf("\n");
  #endif
  
      if (offset < md->offset_max)
        {
        save_offset3 = md->offset_vector[md->offset_end - number];
        save_capture_last = md->capture_last;
  	  if (ES3_Compatible_Behavior) // clear all matches for groups > than this one
  	  {							   //  (we only really need to reset all enclosed groups, but covering all groups > this is harmless because
  								   //   we interpret from left to right)
  			savedElems = (offset_top > offset ? offset_top - offset : 2);
              if (savedElems > frame->XoffsetStackSaveMax)
              {
                  if (frame->XoffsetStackSave != frame->XoffsetStackSaveStg)
                  {
                      (pcre_free)(frame->XoffsetStackSave);
                  }
  
                  frame->XoffsetStackSave = (int *)(pcre_malloc)(savedElems * sizeof(int));
                  if (frame->XoffsetStackSave == NULL)
                  {
                      RRETURN(PCRE_ERROR_NOMEMORY);
                  }
                  frame->XoffsetStackSaveMax = savedElems;
              }
  			VMPI_memcpy(offsetStackSave, md->offset_vector+offset, (savedElems * sizeof(int)));
  			for(int resetOffset = offset+2; resetOffset < offset_top; resetOffset++)
  				md->offset_vector[resetOffset] = -1;
  	  }
  	  else
  	  {
  			offsetStackSave[1] = md->offset_vector[offset];
  			offsetStackSave[2] = md->offset_vector[offset+1];
  			savedElems = 0;
  	  }
  	  
  
  
        DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3));
        md->offset_vector[md->offset_end - number] = eptr - md->start_subject;
  
        flags = (op == OP_SCBRA)? match_cbegroup : 0;
        do
          {
          RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
            ims, eptrb, flags, RM1);
          if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
          md->capture_last = save_capture_last;
          ecode += GET(ecode, 1);
          }
        while (*ecode == OP_ALT);
  
        DPRINTF(("bracket %d failed\n", number));
  
  	  if (ES3_Compatible_Behavior) 
  	  {
              AvmAssert(savedElems <= frame->XoffsetStackSaveMax);
  			VMPI_memcpy(md->offset_vector+offset, offsetStackSave, (savedElems * sizeof(int)));
  	  }
  	  else
  	  {     
  		  md->offset_vector[offset] = stacksave[1];
            md->offset_vector[offset+1] = stacksave[2];
  	  }
        md->offset_vector[md->offset_end - number] = save_offset3;
  
        RRETURN(MATCH_NOMATCH);
        }
  
      /* FALL THROUGH ... Insufficient room for saving captured contents. Treat
      as a non-capturing bracket. */
  
      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
  
      DPRINTF(("insufficient capture room: treat as non-capturing\n"));
  
      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
  
      /* Non-capturing bracket. Loop for all the alternatives. When we get to the
      final alternative within the brackets, we would return the result of a
      recursive call to match() whatever happened. We can reduce stack usage by
      turning this into a tail recursion, except in the case when match_cbegroup
      is set.*/
  
      case OP_BRA:
      case OP_SBRA:
      DPRINTF(("start non-capturing bracket\n"));
      flags = (op >= OP_SBRA)? match_cbegroup : 0;
      for (;;)
        {
        if (ecode[GET(ecode, 1)] != OP_ALT)   /* Final alternative */
          {
          if (flags == 0)    /* Not a possibly empty group */
            {
            ecode += _pcre_OP_lengths[*ecode];
            DPRINTF(("bracket 0 tail recursion\n"));
            goto TAIL_RECURSE;
            }
  
          /* Possibly empty group; can't use tail recursion. */
  
          RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md, ims,
            eptrb, flags, RM48);
          RRETURN(rrc);
          }
  
        /* For non-final alternatives, continue the loop for a NOMATCH result;
        otherwise return. */
  
        RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md, ims,
          eptrb, flags, RM2);
        if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
        ecode += GET(ecode, 1);
        }
      /* Control never reaches here. */
  
      /* Conditional group: compilation checked that there are no more than
      two branches. If the condition is false, skipping the first branch takes us
      past the end if there is only one branch, but that's OK because that is
      exactly what going to the ket would do. As there is only one branch to be
      obeyed, we can use tail recursion to avoid using another stack frame. */
  
      case OP_COND:
      case OP_SCOND:
      if (ecode[LINK_SIZE+1] == OP_RREF)         /* Recursion test */
        {
        offset = GET2(ecode, LINK_SIZE + 2);     /* Recursion group number*/
        condition = md->recursive != NULL &&
          (offset == RREF_ANY || offset == md->recursive->group_num);
        ecode += condition? 3 : GET(ecode, 1);
        }
  
      else if (ecode[LINK_SIZE+1] == OP_CREF)    /* Group used test */
        {
        offset = GET2(ecode, LINK_SIZE+2) << 1;  /* Doubled ref number */
        condition = offset < offset_top && md->offset_vector[offset] >= 0;
        ecode += condition? 3 : GET(ecode, 1);
        }
  
      else if (ecode[LINK_SIZE+1] == OP_DEF)     /* DEFINE - always false */
        {
        condition = FALSE;
        ecode += GET(ecode, 1);
        }
  
      /* The condition is an assertion. Call match() to evaluate it - setting
      the final argument match_condassert causes it to stop at the end of an
      assertion. */
  
      else
        {
        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL,
            match_condassert, RM3);
        if (rrc == MATCH_MATCH)
          {
          condition = TRUE;
          ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE + 2);
          while (*ecode == OP_ALT) ecode += GET(ecode, 1);
          }
        else if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN)
          {
          RRETURN(rrc);         /* Need braces because of following else */
          }
        else
          {
          condition = FALSE;
          ecode += GET(ecode, 1);
          }
        }
  
      /* We are now at the branch that is to be obeyed. As there is only one,
      we can use tail recursion to avoid using another stack frame, except when
      match_cbegroup is required for an unlimited repeat of a possibly empty
      group. If the second alternative doesn't exist, we can just plough on. */
  
      if (condition || *ecode == OP_ALT)
        {
        ecode += 1 + LINK_SIZE;
        if (op == OP_SCOND)        /* Possibly empty group */
          {
          RMATCH(eptr, ecode, offset_top, md, ims, eptrb, match_cbegroup, RM49);
          RRETURN(rrc);
          }
        else                       /* Group must match something */
          {
          flags = 0;
          goto TAIL_RECURSE;
          }
        }
      else                         /* Condition false & no 2nd alternative */
        {
        ecode += 1 + LINK_SIZE;
        }
      break;
  
  
      /* End of the pattern, either real or forced. If we are in a top-level
      recursion, we should restore the offsets appropriately and continue from
      after the call. */
  
      case OP_ACCEPT:
      case OP_END:
      if (md->recursive != NULL && md->recursive->group_num == 0)
        {
        recursion_info *rec = md->recursive;
        DPRINTF(("End of pattern in a (?0) recursion\n"));
        md->recursive = rec->prevrec;
        VMPI_memmove(md->offset_vector, rec->offset_save,
          rec->saved_max * sizeof(int));
        mstart = rec->save_start;
        ims = original_ims;
        ecode = rec->after_call;
        break;
        }
  
      /* Otherwise, if PCRE_NOTEMPTY is set, fail if we have matched an empty
      string - backtracking will then try other alternatives, if any. */
  
      if (md->notempty && eptr == mstart) RRETURN(MATCH_NOMATCH);
      md->end_match_ptr = eptr;           /* Record where we ended */
      if (!ES3_Compatible_Behavior)
      md->end_offset_top = offset_top;    /* and how many extracts were taken */
      md->start_match_ptr = mstart;       /* and the start (\K can modify) */
      RRETURN(MATCH_MATCH);
  
      /* Change option settings */
  
      case OP_OPT:
      ims = ecode[1];
      ecode += 2;
      DPRINTF(("ims set to %02lx\n", ims));
      break;
  
      /* Assertion brackets. Check the alternative branches in turn - the
      matching won't pass the KET for an assertion. If any one branch matches,
      the assertion is true. Lookbehind assertions have an OP_REVERSE item at the
      start of each branch to move the current point backwards, so the code at
      this level is identical to the lookahead case. */
  
      case OP_ASSERT:
      case OP_ASSERTBACK:
      do
        {
        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, 0,
          RM4);
        if (rrc == MATCH_MATCH) break;
        if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
        ecode += GET(ecode, 1);
        }
      while (*ecode == OP_ALT);
      if (*ecode == OP_KET) RRETURN(MATCH_NOMATCH);
  
      /* If checking an assertion for a condition, return MATCH_MATCH. */
  
      if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH);
  
      /* Continue from after the assertion, updating the offsets high water
      mark, since extracts may have been taken during the assertion. */
  
      do ecode += GET(ecode,1); while (*ecode == OP_ALT);
      ecode += 1 + LINK_SIZE;
      offset_top = md->end_offset_top;
      continue;
  
      /* Negative assertion: all branches must fail to match */
  
      case OP_ASSERT_NOT:
      case OP_ASSERTBACK_NOT:
      do
        {
        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, 0,
          RM5);
        if (rrc == MATCH_MATCH) RRETURN(MATCH_NOMATCH);
        if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
        ecode += GET(ecode,1);
        }
      while (*ecode == OP_ALT);
  
      if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH);
  
      ecode += 1 + LINK_SIZE;
      continue;
  
      /* Move the subject pointer back. This occurs only at the start of
      each branch of a lookbehind assertion. If we are too close to the start to
      move back, this match function fails. When working with UTF-8 we move
      back a number of characters, not bytes. */
  
      case OP_REVERSE:
  #ifdef SUPPORT_UTF8
      if (utf8)
        {
        i = GET(ecode, 1);
        while (i-- > 0)
          {
          eptr--;
          if (eptr < md->start_subject) RRETURN(MATCH_NOMATCH);
          BACKCHAR(eptr);
          }
        }
      else
  #endif
  
      /* No UTF-8 support, or not in UTF-8 mode: count is byte count */
  
        {
        eptr -= GET(ecode, 1);
        if (eptr < md->start_subject) RRETURN(MATCH_NOMATCH);
        }
  
      /* Skip to next op code */
  
      ecode += 1 + LINK_SIZE;
      break;
  
      /* The callout item calls an external function, if one is provided, passing
      details of the match so far. This is mainly for debugging, though the
      function is able to force a failure. */
  
      case OP_CALLOUT:
      if (pcre_callout != NULL)
        {
        pcre_callout_block cb;
        cb.version          = 1;   /* Version 1 of the callout block */
        cb.callout_number   = ecode[1];
        cb.offset_vector    = md->offset_vector;
        cb.subject          = (PCRE_SPTR)md->start_subject;
        cb.subject_length   = md->end_subject - md->start_subject;
        cb.start_match      = mstart - md->start_subject;
        cb.current_position = eptr - md->start_subject;
        cb.pattern_position = GET(ecode, 2);
        cb.next_item_length = GET(ecode, 2 + LINK_SIZE);
        cb.capture_top      = offset_top/2;
        cb.capture_last     = md->capture_last;
        cb.callout_data     = md->callout_data;
        if ((rrc = (*pcre_callout)(&cb)) > 0) RRETURN(MATCH_NOMATCH);
        if (rrc < 0) RRETURN(rrc);
        }
      ecode += 2 + 2*LINK_SIZE;
      break;
  
      /* Recursion either matches the current regex, or some subexpression. The
      offset data is the offset to the starting bracket from the start of the
      whole pattern. (This is so that it works from duplicated subpatterns.)
  
      If there are any capturing brackets started but not finished, we have to
      save their starting points and reinstate them after the recursion. However,
      we don't know how many such there are (offset_top records the completed
      total) so we just have to save all the potential data. There may be up to
      65535 such values, which is too large to put on the stack, but using malloc
      for small numbers seems expensive. As a compromise, the stack is used when
      there are no more than REC_STACK_SAVE_MAX values to store; otherwise malloc
      is used. A problem is what to do if the malloc fails ... there is no way of
      returning to the top level with an error. Save the top REC_STACK_SAVE_MAX
      values on the stack, and accept that the rest may be wrong.
  
      There are also other values that have to be saved. We use a chained
      sequence of blocks that actually live on the stack. Thanks to Robin Houston
      for the original version of this logic. */
  
      case OP_RECURSE:
        {
        callpat = md->start_code + GET(ecode, 1);
        new_recursive.group_num = (callpat == md->start_code)? 0 :
          GET2(callpat, 1 + LINK_SIZE);
  
        /* Add to "recursing stack" */
  
        new_recursive.prevrec = md->recursive;
        md->recursive = &new_recursive;
  
        /* Find where to continue from afterwards */
  
        ecode += 1 + LINK_SIZE;
        new_recursive.after_call = ecode;
  
        /* Now save the offset data. */
  
        new_recursive.saved_max = md->offset_end;
        if (new_recursive.saved_max <= REC_STACK_SAVE_MAX)
          new_recursive.offset_save = stacksave;
        else
          {
          new_recursive.offset_save =
            (int *)(pcre_malloc)(new_recursive.saved_max * sizeof(int));
          if (new_recursive.offset_save == NULL) RRETURN(PCRE_ERROR_NOMEMORY);
          }
  
        VMPI_memcpy(new_recursive.offset_save, md->offset_vector,
              new_recursive.saved_max * sizeof(int));
        new_recursive.save_start = mstart;
        mstart = eptr;
  
        /* OK, now we can do the recursion. For each top-level alternative we
        restore the offset and recursion data. */
  
        DPRINTF(("Recursing into group %d\n", new_recursive.group_num));
        flags = (*callpat >= OP_SBRA)? match_cbegroup : 0;
        do
          {
          RMATCH(eptr, callpat + _pcre_OP_lengths[*callpat], offset_top,
            md, ims, eptrb, flags, RM6);
          if (rrc == MATCH_MATCH)
            {
            DPRINTF(("Recursion matched\n"));
            md->recursive = new_recursive.prevrec;
            if (new_recursive.offset_save != stacksave)
              (pcre_free)(new_recursive.offset_save);
            RRETURN(MATCH_MATCH);
            }
          else if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN)
            {
            DPRINTF(("Recursion gave error %d\n", rrc));
            RRETURN(rrc);
            }
  
          md->recursive = &new_recursive;
          VMPI_memcpy(md->offset_vector, new_recursive.offset_save,
              new_recursive.saved_max * sizeof(int));
          callpat += GET(callpat, 1);
          }
        while (*callpat == OP_ALT);
  
        DPRINTF(("Recursion didn't match\n"));
        md->recursive = new_recursive.prevrec;
        if (new_recursive.offset_save != stacksave)
          (pcre_free)(new_recursive.offset_save);
        RRETURN(MATCH_NOMATCH);
        }
      /* Control never reaches here */
  
      /* "Once" brackets are like assertion brackets except that after a match,
      the point in the subject string is not moved back. Thus there can never be
      a move back into the brackets. Friedl calls these "atomic" subpatterns.
      Check the alternative branches in turn - the matching won't pass the KET
      for this kind of subpattern. If any one branch matches, we carry on as at
      the end of a normal bracket, leaving the subject pointer. */
  
      case OP_ONCE:
      prev = ecode;
      saved_eptr = eptr;
  
      do
        {
        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM7);
        if (rrc == MATCH_MATCH) break;
        if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
        ecode += GET(ecode,1);
        }
      while (*ecode == OP_ALT);
  
      /* If hit the end of the group (which could be repeated), fail */
  
      if (*ecode != OP_ONCE && *ecode != OP_ALT) RRETURN(MATCH_NOMATCH);
  
      /* Continue as from after the assertion, updating the offsets high water
      mark, since extracts may have been taken. */
  
      do ecode += GET(ecode, 1); while (*ecode == OP_ALT);
  
      offset_top = md->end_offset_top;
      eptr = md->end_match_ptr;
  
      /* For a non-repeating ket, just continue at this level. This also
      happens for a repeating ket if no characters were matched in the group.
      This is the forcible breaking of infinite loops as implemented in Perl
      5.005. If there is an options reset, it will get obeyed in the normal
      course of events. */
  
      if (*ecode == OP_KET || eptr == saved_eptr)
        {
        ecode += 1+LINK_SIZE;
        break;
        }
  
      /* The repeating kets try the rest of the pattern or restart from the
      preceding bracket, in the appropriate order. The second "call" of match()
      uses tail recursion, to avoid using another stack frame. We need to reset
      any options that changed within the bracket before re-running it, so
      check the next opcode. */
  
      if (ecode[1+LINK_SIZE] == OP_OPT)
        {
        ims = (ims & ~PCRE_IMS) | ecode[4];
        DPRINTF(("ims set to %02lx at group repeat\n", ims));
        }
  
      if (*ecode == OP_KETRMIN)
        {
        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM8);
        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
        ecode = prev;
        flags = 0;
        goto TAIL_RECURSE;
        }
      else  /* OP_KETRMAX */
        {
        RMATCH(eptr, prev, offset_top, md, ims, eptrb, match_cbegroup, RM9);
        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
        ecode += 1 + LINK_SIZE;
        flags = 0;
        goto TAIL_RECURSE;
        }
      /* Control never gets here */
  
      /* An alternation is the end of a branch; scan along to find the end of the
      bracketed group and go to there. */
  
      case OP_ALT:
      do ecode += GET(ecode,1); while (*ecode == OP_ALT);
      break;
  
      /* BRAZERO and BRAMINZERO occur just before a bracket group, indicating
      that it may occur zero times. It may repeat infinitely, or not at all -
      i.e. it could be ()* or ()? in the pattern. Brackets with fixed upper
      repeat limits are compiled as a number of copies, with the optional ones
      preceded by BRAZERO or BRAMINZERO. */
  
      case OP_BRAZERO:
        {
        next = ecode+1;
        RMATCH(eptr, next, offset_top, md, ims, eptrb, 0, RM10);
        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
        do next += GET(next,1); while (*next == OP_ALT);
        ecode = next + 1 + LINK_SIZE;
        }
      break;
  
      case OP_BRAMINZERO:
        {
        next = ecode+1;
        do next += GET(next, 1); while (*next == OP_ALT);
        RMATCH(eptr, next + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0, RM11);
        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
        ecode++;
        }
      break;
  
      /* End of a group, repeated or non-repeating. */
  
      case OP_KET:
      case OP_KETRMIN:
      case OP_KETRMAX:
      prev = ecode - GET(ecode, 1);
  
      /* If this was a group that remembered the subject start, in order to break
      infinite repeats of empty string matches, retrieve the subject start from
      the chain. Otherwise, set it NULL. */
  
      if (*prev >= OP_SBRA)
        {
        saved_eptr = eptrb->epb_saved_eptr;   /* Value at start of group */
        eptrb = eptrb->epb_prev;              /* Backup to previous group */
        }
      else saved_eptr = NULL;
  
      /* If we are at the end of an assertion group, stop matching and return
      MATCH_MATCH, but record the current high water mark for use by positive
      assertions. Do this also for the "once" (atomic) groups. */
  
      if (*prev == OP_ASSERT || *prev == OP_ASSERT_NOT ||
          *prev == OP_ASSERTBACK || *prev == OP_ASSERTBACK_NOT ||
          *prev == OP_ONCE)
        {
        md->end_match_ptr = eptr;      /* For ONCE */
        if (!ES3_Compatible_Behavior)
        md->end_offset_top = offset_top;
  		else if(*prev != OP_ONCE)
  		{
  			// clear matches in zero width negative lookaheads, see ECMA section 15.10.2.8
  			bool prev_op_was_negative = (*prev == OP_ASSERT_NOT || *prev == OP_ASSERTBACK_NOT);
  			while(prev < ecode) {
  				if(*prev == OP_CBRA || *prev == OP_SCBRA) {
  					offset = GET2(prev, 1+LINK_SIZE)<<1;
  					if (prev_op_was_negative)
  					{
  						md->offset_vector[offset] = -1;
   						md->offset_vector[offset+1] = -1;
  					}
  					prev += _pcre_OP_lengths[*prev];
  				} else { 
  					int c = *prev;
  					prev += _pcre_OP_lengths[*prev];
  #ifdef SUPPORT_UTF8
  					if (utf8) switch(c)
  					{
  					case OP_CHAR:
  					case OP_CHARNC:
  					case OP_EXACT:
  					case OP_UPTO:
  					case OP_MINUPTO:
  					case OP_POSUPTO:
  					case OP_STAR:
  					case OP_MINSTAR:
  					case OP_POSSTAR:
  					case OP_PLUS:
  					case OP_MINPLUS:
  					case OP_POSPLUS:
  					case OP_QUERY:
  					case OP_MINQUERY:
  					case OP_POSQUERY:
  						if (prev[-1] >= 0xc0) 
  							prev += _pcre_utf8_table4[prev[-1] & 0x3f];
  						break;
  					case OP_XCLASS:
  						  prev += GET(prev, 1);  // length of xclass stored in the code, 0 in OP_lengths table
  						  break;
  					}
  #endif
  				}
  			}
  			// reset prev
  			prev = ecode - GET(ecode, 1);
  		}
  
        RRETURN(MATCH_MATCH);
        }
  
      /* For capturing groups we have to check the group number back at the start
      and if necessary complete handling an extraction by setting the offsets and
      bumping the high water mark. Note that whole-pattern recursion is coded as
      a recurse into group 0, so it won't be picked up here. Instead, we catch it
      when the OP_END is reached. Other recursion is handled here. */
  
      if (*prev == OP_CBRA || *prev == OP_SCBRA)
        {
        number = GET2(prev, 1+LINK_SIZE);
        offset = number << 1;
  
  #ifdef PCRE_DEBUG
        printf("end bracket %d", number);
        printf("\n");
  #endif
  
        md->capture_last = number;
        if (offset >= md->offset_max) md->offset_overflow = TRUE; else
          {
          md->offset_vector[offset] =
            md->offset_vector[md->offset_end - number];
          md->offset_vector[offset+1] = eptr - md->start_subject;
          if (offset_top <= offset) offset_top = offset + 2;
  
  		if (ES3_Compatible_Behavior && (offset_top > md->end_offset_top))
  			md->end_offset_top = offset_top;
  
          }
  
        /* Handle a recursively called group. Restore the offsets
        appropriately and continue from after the call. */
  
        if (md->recursive != NULL && md->recursive->group_num == number)
          {
          recursion_info *rec = md->recursive;
          DPRINTF(("Recursion (%d) succeeded - continuing\n", number));
          md->recursive = rec->prevrec;
          mstart = rec->save_start;
          VMPI_memcpy(md->offset_vector, rec->offset_save,
            rec->saved_max * sizeof(int));
          ecode = rec->after_call;
          ims = original_ims;
          break;
          }
        }
  
      /* For both capturing and non-capturing groups, reset the value of the ims
      flags, in case they got changed during the group. */
  
      ims = original_ims;
      DPRINTF(("ims reset to %02lx\n", ims));
  
      /* For a non-repeating ket, just continue at this level. This also
      happens for a repeating ket if no characters were matched in the group.
      This is the forcible breaking of infinite loops as implemented in Perl
      5.005. If there is an options reset, it will get obeyed in the normal
      course of events. */
  
      if (*ecode == OP_KET || eptr == saved_eptr)
        {
        ecode += 1 + LINK_SIZE;
        break;
        }
  
      /* The repeating kets try the rest of the pattern or restart from the
      preceding bracket, in the appropriate order. In the second case, we can use
      tail recursion to avoid using another stack frame, unless we have an
      unlimited repeat of a group that can match an empty string. */
  
      flags = (*prev >= OP_SBRA)? match_cbegroup : 0;
  
      if (*ecode == OP_KETRMIN)
        {
        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM12);
        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
        if (flags != 0)    /* Could match an empty string */
          {
          RMATCH(eptr, prev, offset_top, md, ims, eptrb, flags, RM50);
          RRETURN(rrc);
          }
        ecode = prev;
        goto TAIL_RECURSE;
        }
      else  /* OP_KETRMAX */
        {
        RMATCH(eptr, prev, offset_top, md, ims, eptrb, flags, RM13);
        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
        ecode += 1 + LINK_SIZE;
        flags = 0;
        goto TAIL_RECURSE;
        }
      /* Control never gets here */
  
      /* Start of subject unless notbol, or after internal newline if multiline */
  
      case OP_CIRC:
      if (md->notbol && eptr == md->start_subject) RRETURN(MATCH_NOMATCH);
      if ((ims & PCRE_MULTILINE) != 0)
        {
        if (eptr != md->start_subject &&
            (eptr == md->end_subject || !WAS_NEWLINE(eptr)))
          RRETURN(MATCH_NOMATCH);
        ecode++;
        break;
        }
      /* ... else fall through */
  
      /* Start of subject assertion */
  
      case OP_SOD:
      if (eptr != md->start_subject) RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      /* Start of match assertion */
  
      case OP_SOM:
      if (eptr != md->start_subject + md->start_offset) RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      /* Reset the start of match point */
  
      case OP_SET_SOM:
      mstart = eptr;
      ecode++;
      break;
  
      /* Assert before internal newline if multiline, or before a terminating
      newline unless endonly is set, else end of subject unless noteol is set. */
  
      case OP_DOLL:
      if ((ims & PCRE_MULTILINE) != 0)
        {
        if (eptr < md->end_subject)
          { if (!IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH); }
        else
          { if (md->noteol) RRETURN(MATCH_NOMATCH); }
        ecode++;
        break;
        }
      else
        {
        if (md->noteol) RRETURN(MATCH_NOMATCH);
        if (!md->endonly)
          {
          if (eptr != md->end_subject &&
              (!IS_NEWLINE(eptr) || eptr != md->end_subject - md->nllen))
            RRETURN(MATCH_NOMATCH);
          ecode++;
          break;
          }
        }
      /* ... else fall through for endonly */
  
      /* End of subject assertion (\z) */
  
      case OP_EOD:
      if (eptr < md->end_subject) RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      /* End of subject or ending \n assertion (\Z) */
  
      case OP_EODN:
      if (eptr != md->end_subject &&
          (!IS_NEWLINE(eptr) || eptr != md->end_subject - md->nllen))
        RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      /* Word boundary assertions */
  
      case OP_NOT_WORD_BOUNDARY:
      case OP_WORD_BOUNDARY:
        {
  
        /* Find out if the previous and current characters are "word" characters.
        It takes a bit more work in UTF-8 mode. Characters > 255 are assumed to
        be "non-word" characters. */
  
  #ifdef SUPPORT_UTF8
        if (utf8)
          {
          if (eptr == md->start_subject) prev_is_word = FALSE; else
            {
            const uschar *lastptr = eptr - 1;
            while((*lastptr & 0xc0) == 0x80) lastptr--;
            GETCHAR(c, lastptr);
            prev_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0;
            }
          if (eptr >= md->end_subject) cur_is_word = FALSE; else
            {
            GETCHAR(c, eptr);
            cur_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0;
            }
          }
        else
  #endif
  
        /* More streamlined when not in UTF-8 mode */
  
          {
          prev_is_word = (eptr != md->start_subject) &&
            ((md->ctypes[eptr[-1]] & ctype_word) != 0);
          cur_is_word = (eptr < md->end_subject) &&
            ((md->ctypes[*eptr] & ctype_word) != 0);
          }
  
        /* Now see if the situation is what we want */
  
        if ((*ecode++ == OP_WORD_BOUNDARY)?
             cur_is_word == prev_is_word : cur_is_word != prev_is_word)
          RRETURN(MATCH_NOMATCH);
        }
      break;
  
      /* Match a single character type; inline for speed */
  
      case OP_ANY:
      if ((ims & PCRE_DOTALL) == 0)
        {
        if (IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH);
        }
      if (eptr++ >= md->end_subject) RRETURN(MATCH_NOMATCH);
      if (utf8)
        while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;
      ecode++;
      break;
  
      /* Match a single byte, even in UTF-8 mode. This opcode really does match
      any byte, even newline, independent of the setting of PCRE_DOTALL. */
  
      case OP_ANYBYTE:
      if (eptr++ >= md->end_subject) RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      case OP_NOT_DIGIT:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      if (
  #ifdef SUPPORT_UTF8
         c < 256 &&
  #endif
         (md->ctypes[c] & ctype_digit) != 0
         )
        RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      case OP_DIGIT:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      if (
  #ifdef SUPPORT_UTF8
         c >= 256 ||
  #endif
         (md->ctypes[c] & ctype_digit) == 0
         )
        RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      case OP_NOT_WHITESPACE:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
     	if (c < 256)
  	{
  		if ((md->ctypes[c] & ctype_space) != 0)
  		{
  			RRETURN(MATCH_NOMATCH);
  		}
  	}
  	else if (isUnicodeWhiteSpace(c) == true)
     	{
        RRETURN(MATCH_NOMATCH);
     	}
      ecode++;
      break;
  
      case OP_WHITESPACE:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      if (c < 256)
  	{
         if ((md->ctypes[c] & ctype_space) == 0)
  		{
  			RRETURN(MATCH_NOMATCH);
  		}
  	}
  	else if (isUnicodeWhiteSpace(c) == false)
     	{
        RRETURN(MATCH_NOMATCH);
     	}
  
      ecode++;
      break;
  
      case OP_NOT_WORDCHAR:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      if (
  #ifdef SUPPORT_UTF8
         c < 256 &&
  #endif
         (md->ctypes[c] & ctype_word) != 0
         )
        RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      case OP_WORDCHAR:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      if (
  #ifdef SUPPORT_UTF8
         c >= 256 ||
  #endif
         (md->ctypes[c] & ctype_word) == 0
         )
        RRETURN(MATCH_NOMATCH);
      ecode++;
      break;
  
      case OP_ANYNL:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      switch(c)
        {
        default: RRETURN(MATCH_NOMATCH);
        case 0x000d:
        if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
        break;
        case 0x000a:
        case 0x000b:
        case 0x000c:
        case 0x0085:
        case 0x2028:
        case 0x2029:
        break;
        }
      ecode++;
      break;
  
      case OP_NOT_HSPACE:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      switch(c)
        {
        default: break;
        case 0x09:      /* HT */
        case 0x20:      /* SPACE */
        case 0xa0:      /* NBSP */
        case 0x1680:    /* OGHAM SPACE MARK */
        case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */
        case 0x2000:    /* EN QUAD */
        case 0x2001:    /* EM QUAD */
        case 0x2002:    /* EN SPACE */
        case 0x2003:    /* EM SPACE */
        case 0x2004:    /* THREE-PER-EM SPACE */
        case 0x2005:    /* FOUR-PER-EM SPACE */
        case 0x2006:    /* SIX-PER-EM SPACE */
        case 0x2007:    /* FIGURE SPACE */
        case 0x2008:    /* PUNCTUATION SPACE */
        case 0x2009:    /* THIN SPACE */
        case 0x200A:    /* HAIR SPACE */
        case 0x202f:    /* NARROW NO-BREAK SPACE */
        case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */
        case 0x3000:    /* IDEOGRAPHIC SPACE */
        RRETURN(MATCH_NOMATCH);
        }
      ecode++;
      break;
  
      case OP_HSPACE:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      switch(c)
        {
        default: RRETURN(MATCH_NOMATCH);
        case 0x09:      /* HT */
        case 0x20:      /* SPACE */
        case 0xa0:      /* NBSP */
        case 0x1680:    /* OGHAM SPACE MARK */
        case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */
        case 0x2000:    /* EN QUAD */
        case 0x2001:    /* EM QUAD */
        case 0x2002:    /* EN SPACE */
        case 0x2003:    /* EM SPACE */
        case 0x2004:    /* THREE-PER-EM SPACE */
        case 0x2005:    /* FOUR-PER-EM SPACE */
        case 0x2006:    /* SIX-PER-EM SPACE */
        case 0x2007:    /* FIGURE SPACE */
        case 0x2008:    /* PUNCTUATION SPACE */
        case 0x2009:    /* THIN SPACE */
        case 0x200A:    /* HAIR SPACE */
        case 0x202f:    /* NARROW NO-BREAK SPACE */
        case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */
        case 0x3000:    /* IDEOGRAPHIC SPACE */
        break;
        }
      ecode++;
      break;
  
      case OP_NOT_VSPACE:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      switch(c)
        {
        default: break;
        case 0x0a:      /* LF */
        case 0x0b:      /* VT */
        case 0x0c:      /* FF */
        case 0x0d:      /* CR */
        case 0x85:      /* NEL */
        case 0x2028:    /* LINE SEPARATOR */
        case 0x2029:    /* PARAGRAPH SEPARATOR */
        RRETURN(MATCH_NOMATCH);
        }
      ecode++;
      break;
  
      case OP_VSPACE:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
      switch(c)
        {
        default: RRETURN(MATCH_NOMATCH);
        case 0x0a:      /* LF */
        case 0x0b:      /* VT */
        case 0x0c:      /* FF */
        case 0x0d:      /* CR */
        case 0x85:      /* NEL */
        case 0x2028:    /* LINE SEPARATOR */
        case 0x2029:    /* PARAGRAPH SEPARATOR */
        break;
        }
      ecode++;
      break;
  
  #ifdef SUPPORT_UCP
      /* Check the next character by Unicode property. We will get here only
      if the support is in the binary; otherwise a compile-time error occurs. */
  
      case OP_PROP:
      case OP_NOTPROP:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
        {
        int chartype, script;
        int category = _pcre_ucp_findprop(c, &chartype, &script);
  
        switch(ecode[1])
          {
          case PT_ANY:
          if (op == OP_NOTPROP) RRETURN(MATCH_NOMATCH);
          break;
  
          case PT_LAMP:
          if ((chartype == ucp_Lu ||
               chartype == ucp_Ll ||
               chartype == ucp_Lt) == (op == OP_NOTPROP))
            RRETURN(MATCH_NOMATCH);
           break;
  
          case PT_GC:
          if ((ecode[2] != category) == (op == OP_PROP))
            RRETURN(MATCH_NOMATCH);
          break;
  
          case PT_PC:
          if ((ecode[2] != chartype) == (op == OP_PROP))
            RRETURN(MATCH_NOMATCH);
          break;
  
          case PT_SC:
          if ((ecode[2] != script) == (op == OP_PROP))
            RRETURN(MATCH_NOMATCH);
          break;
  
          default:
          RRETURN(PCRE_ERROR_INTERNAL);
          }
  
        ecode += 3;
        }
      break;
  
      /* Match an extended Unicode sequence. We will get here only if the support
      is in the binary; otherwise a compile-time error occurs. */
  
      case OP_EXTUNI:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      GETCHARINCTEST(c, eptr);
        {
        int chartype, script;
        int category = _pcre_ucp_findprop(c, &chartype, &script);
        if (category == ucp_M) RRETURN(MATCH_NOMATCH);
        while (eptr < md->end_subject)
          {
          int len = 1;
          if (!utf8) c = *eptr; else
            {
            GETCHARLEN(c, eptr, len);
            }
          category = _pcre_ucp_findprop(c, &chartype, &script);
          if (category != ucp_M) break;
          eptr += len;
          }
        }
      ecode++;
      break;
  #endif
  
  
      /* Match a back reference, possibly repeatedly. Look past the end of the
      item to see if there is repeat information following. The code is similar
      to that for character classes, but repeated for efficiency. Then obey
      similar code to character type repeats - written out again for speed.
      However, if the referenced string is the empty string, always treat
      it as matched, any number of times (otherwise there could be infinite
      loops). */
  
      case OP_REF:
        {
        offset = GET2(ecode, 1) << 1;               /* Doubled ref number */
        ecode += 3;                                 /* Advance past item */
  
        /* If the reference is unset, set the length to be longer than the amount
        of subject left; this ensures that every attempt at a match fails. We
        can't just fail here, because of the possibility of quantifiers with zero
        minima. */
  
        if (ES3_Compatible_Behavior && md->offset_vector[offset] < 0)
  		  length = 0;
  	  else
        length = (offset >= offset_top || md->offset_vector[offset] < 0)?
          md->end_subject - eptr + 1 :
          md->offset_vector[offset+1] - md->offset_vector[offset];
  
        /* Set up for repetition, or handle the non-repeated case */
  
        switch (*ecode)
          {
          case OP_CRSTAR:
          case OP_CRMINSTAR:
          case OP_CRPLUS:
          case OP_CRMINPLUS:
          case OP_CRQUERY:
          case OP_CRMINQUERY:
          c = *ecode++ - OP_CRSTAR;
          minimize = (c & 1) != 0;
          min = rep_min[c];                 /* Pick up values from tables; */
          max = rep_max[c];                 /* zero for max => infinity */
          if (max == 0) max = INT_MAX;
          break;
  
          case OP_CRRANGE:
          case OP_CRMINRANGE:
          minimize = (*ecode == OP_CRMINRANGE);
          min = GET2(ecode, 1);
          max = GET2(ecode, 3);
          if (max == 0) max = INT_MAX;
          ecode += 5;
          break;
  
          default:               /* No repeat follows */
          if (!match_ref(offset, eptr, length, md, ims)) RRETURN(MATCH_NOMATCH);
          eptr += length;
          continue;              /* With the main loop */
          }
  
        /* If the length of the reference is zero, just continue with the
        main loop. */
  
        if (length == 0) continue;
  
        /* First, ensure the minimum number of matches are present. We get back
        the length of the reference string explicitly rather than passing the
        address of eptr, so that eptr can be a register variable. */
  
        for (i = 1; i <= min; i++)
          {
          if (!match_ref(offset, eptr, length, md, ims)) RRETURN(MATCH_NOMATCH);
          eptr += length;
          }
  
        /* If min = max, continue at the same level without recursion.
        They are not both allowed to be zero. */
  
        if (min == max) continue;
  
        /* If minimizing, keep trying and advancing the pointer */
  
        if (minimize)
          {
          for (fi = min;; fi++)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM14);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max || !match_ref(offset, eptr, length, md, ims))
              RRETURN(MATCH_NOMATCH);
            eptr += length;
            }
          /* Control never gets here */
          }
  
        /* If maximizing, find the longest string and work backwards */
  
        else
          {
          pp = eptr;
          for (i = min; i < max; i++)
            {
            if (!match_ref(offset, eptr, length, md, ims)) break;
            eptr += length;
            }
          while (eptr >= pp)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM15);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            eptr -= length;
            }
          RRETURN(MATCH_NOMATCH);
          }
        }
      /* Control never gets here */
  
  
  
      /* Match a bit-mapped character class, possibly repeatedly. This op code is
      used when all the characters in the class have values in the range 0-255,
      and either the matching is caseful, or the characters are in the range
      0-127 when UTF-8 processing is enabled. The only difference between
      OP_CLASS and OP_NCLASS occurs when a data character outside the range is
      encountered.
  
      First, look past the end of the item to see if there is repeat information
      following. Then obey similar code to character type repeats - written out
      again for speed. */
  
      case OP_NCLASS:
      case OP_CLASS:
        {
        data = ecode + 1;                /* Save for matching */
        ecode += 33;                     /* Advance past the item */
  
        switch (*ecode)
          {
          case OP_CRSTAR:
          case OP_CRMINSTAR:
          case OP_CRPLUS:
          case OP_CRMINPLUS:
          case OP_CRQUERY:
          case OP_CRMINQUERY:
          c = *ecode++ - OP_CRSTAR;
          minimize = (c & 1) != 0;
          min = rep_min[c];                 /* Pick up values from tables; */
          max = rep_max[c];                 /* zero for max => infinity */
          if (max == 0) max = INT_MAX;
          break;
  
          case OP_CRRANGE:
          case OP_CRMINRANGE:
          minimize = (*ecode == OP_CRMINRANGE);
          min = GET2(ecode, 1);
          max = GET2(ecode, 3);
          if (max == 0) max = INT_MAX;
          ecode += 5;
          break;
  
          default:               /* No repeat follows */
          min = max = 1;
          break;
          }
  
        /* First, ensure the minimum number of matches are present. */
  
  #ifdef SUPPORT_UTF8
        /* UTF-8 mode */
        if (utf8)
          {
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINC(c, eptr);
            if (c > 255)
              {
              if (op == OP_CLASS) RRETURN(MATCH_NOMATCH);
              }
            else
              {
              if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);
              }
            }
          }
        else
  #endif
        /* Not UTF-8 mode */
          {
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            c = *eptr++;
            if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);
            }
          }
  
        /* If max == min we can continue with the main loop without the
        need to recurse. */
  
        if (min == max) continue;
  
        /* If minimizing, keep testing the rest of the expression and advancing
        the pointer while it matches the class. */
  
        if (minimize)
          {
  #ifdef SUPPORT_UTF8
          /* UTF-8 mode */
          if (utf8)
            {
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM16);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINC(c, eptr);
              if (c > 255)
                {
                if (op == OP_CLASS) RRETURN(MATCH_NOMATCH);
                }
              else
                {
                if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);
                }
              }
            }
          else
  #endif
          /* Not UTF-8 mode */
            {
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM17);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              c = *eptr++;
              if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);
              }
            }
          /* Control never gets here */
          }
  
        /* If maximizing, find the longest possible run, then work backwards. */
  
        else
          {
          pp = eptr;
  
  #ifdef SUPPORT_UTF8
          /* UTF-8 mode */
          if (utf8)
            {
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              if (c > 255)
                {
                if (op == OP_CLASS) break;
                }
              else
                {
                if ((data[c/8] & (1 << (c&7))) == 0) break;
                }
              eptr += len;
              }
            for (;;)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM18);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (eptr-- == pp) break;        /* Stop if tried at original pos */
              BACKCHAR(eptr);
              }
            }
          else
  #endif
            /* Not UTF-8 mode */
            {
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject) break;
              c = *eptr;
              if ((data[c/8] & (1 << (c&7))) == 0) break;
              eptr++;
              }
            while (eptr >= pp)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM19);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              eptr--;
              }
            }
  
          RRETURN(MATCH_NOMATCH);
          }
        }
      /* Control never gets here */
  
  
      /* Match an extended character class. This opcode is encountered only
      in UTF-8 mode, because that's the only time it is compiled. */
  
  #ifdef SUPPORT_UTF8
      case OP_XCLASS:
        {
        data = ecode + 1 + LINK_SIZE;                /* Save for matching */
        ecode += GET(ecode, 1);                      /* Advance past the item */
  
        switch (*ecode)
          {
          case OP_CRSTAR:
          case OP_CRMINSTAR:
          case OP_CRPLUS:
          case OP_CRMINPLUS:
          case OP_CRQUERY:
          case OP_CRMINQUERY:
          c = *ecode++ - OP_CRSTAR;
          minimize = (c & 1) != 0;
          min = rep_min[c];                 /* Pick up values from tables; */
          max = rep_max[c];                 /* zero for max => infinity */
          if (max == 0) max = INT_MAX;
          break;
  
          case OP_CRRANGE:
          case OP_CRMINRANGE:
          minimize = (*ecode == OP_CRMINRANGE);
          min = GET2(ecode, 1);
          max = GET2(ecode, 3);
          if (max == 0) max = INT_MAX;
          ecode += 5;
          break;
  
          default:               /* No repeat follows */
          min = max = 1;
          break;
          }
  
        /* First, ensure the minimum number of matches are present. */
  
        for (i = 1; i <= min; i++)
          {
          if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
          GETCHARINC(c, eptr);
          if (!_pcre_xclass(c, data)) RRETURN(MATCH_NOMATCH);
          }
  
        /* If max == min we can continue with the main loop without the
        need to recurse. */
  
        if (min == max) continue;
  
        /* If minimizing, keep testing the rest of the expression and advancing
        the pointer while it matches the class. */
  
        if (minimize)
          {
          for (fi = min;; fi++)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM20);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINC(c, eptr);
            if (!_pcre_xclass(c, data)) RRETURN(MATCH_NOMATCH);
            }
          /* Control never gets here */
          }
  
        /* If maximizing, find the longest possible run, then work backwards. */
  
        else
          {
          pp = eptr;
          for (i = min; i < max; i++)
            {
            int len = 1;
            if (eptr >= md->end_subject) break;
            GETCHARLEN(c, eptr, len);
            if (!_pcre_xclass(c, data)) break;
            eptr += len;
            }
          for(;;)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM21);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (eptr-- == pp) break;        /* Stop if tried at original pos */
            if (utf8) BACKCHAR(eptr);
            }
          RRETURN(MATCH_NOMATCH);
          }
  
        /* Control never gets here */
        }
  #endif    /* End of XCLASS */
  
      /* Match a single character, casefully */
  
      case OP_CHAR:
  #ifdef SUPPORT_UTF8
      if (utf8)
        {
        length = 1;
        ecode++;
        GETCHARLEN(fc, ecode, length);
        if (length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);
        while (length-- > 0) if (*ecode++ != *eptr++) RRETURN(MATCH_NOMATCH);
        }
      else
  #endif
  
      /* Non-UTF-8 mode */
        {
        if (md->end_subject - eptr < 1) RRETURN(MATCH_NOMATCH);
        if (ecode[1] != *eptr++) RRETURN(MATCH_NOMATCH);
        ecode += 2;
        }
      break;
  
      /* Match a single character, caselessly */
  
      case OP_CHARNC:
  #ifdef SUPPORT_UTF8
      if (utf8)
        {
        length = 1;
        ecode++;
        GETCHARLEN(fc, ecode, length);
  
        if (length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);
  
        /* If the pattern character's value is < 128, we have only one byte, and
        can use the fast lookup table. */
  
        if (fc < 128)
          {
          if (md->lcc[*ecode++] != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH);
          }
  
        /* Otherwise we must pick up the subject character */
  
        else
          {
          unsigned int dc;
          GETCHARINC(dc, eptr);
          ecode += length;
  
          /* If we have Unicode property support, we can use it to test the other
          case of the character, if there is one. */
  
          if (fc != dc)
            {
  #ifdef SUPPORT_UCP
            if (dc != _pcre_ucp_othercase(fc))
  #endif
              RRETURN(MATCH_NOMATCH);
            }
          }
        }
      else
  #endif   /* SUPPORT_UTF8 */
  
      /* Non-UTF-8 mode */
        {
        if (md->end_subject - eptr < 1) RRETURN(MATCH_NOMATCH);
        if (md->lcc[ecode[1]] != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH);
        ecode += 2;
        }
      break;
  
      /* Match a single character repeatedly. */
  
      case OP_EXACT:
      min = max = GET2(ecode, 1);
      ecode += 3;
      goto REPEATCHAR;
  
      case OP_POSUPTO:
      possessive = TRUE;
      /* Fall through */
  
      case OP_UPTO:
      case OP_MINUPTO:
      min = 0;
      max = GET2(ecode, 1);
      minimize = *ecode == OP_MINUPTO;
      ecode += 3;
      goto REPEATCHAR;
  
      case OP_POSSTAR:
      possessive = TRUE;
      min = 0;
      max = INT_MAX;
      ecode++;
      goto REPEATCHAR;
  
      case OP_POSPLUS:
      possessive = TRUE;
      min = 1;
      max = INT_MAX;
      ecode++;
      goto REPEATCHAR;
  
      case OP_POSQUERY:
      possessive = TRUE;
      min = 0;
      max = 1;
      ecode++;
      goto REPEATCHAR;
  
      case OP_STAR:
      case OP_MINSTAR:
      case OP_PLUS:
      case OP_MINPLUS:
      case OP_QUERY:
      case OP_MINQUERY:
      c = *ecode++ - OP_STAR;
      minimize = (c & 1) != 0;
      min = rep_min[c];                 /* Pick up values from tables; */
      max = rep_max[c];                 /* zero for max => infinity */
      if (max == 0) max = INT_MAX;
  
      /* Common code for all repeated single-character matches. We can give
      up quickly if there are fewer than the minimum number of characters left in
      the subject. */
  
      REPEATCHAR:
  #ifdef SUPPORT_UTF8
      if (utf8)
        {
        length = 1;
        charptr = ecode;
        GETCHARLEN(fc, ecode, length);
        if (min * length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);
        ecode += length;
  
        /* Handle multibyte character matching specially here. There is
        support for caseless matching if UCP support is present. */
  
        if (length > 1)
          {
  #ifdef SUPPORT_UCP
          unsigned int othercase;
          if ((ims & PCRE_CASELESS) != 0 &&
              (othercase = _pcre_ucp_othercase(fc)) != NOTACHAR)
            oclength = _pcre_ord2utf8(othercase, occhars);
          else oclength = 0;
  #endif  /* SUPPORT_UCP */
  
          for (i = 1; i <= min; i++)
            {
            if (VMPI_memcmp(eptr, charptr, length) == 0) eptr += length;
  #ifdef SUPPORT_UCP
            /* Need braces because of following else */
            else if (oclength == 0) { RRETURN(MATCH_NOMATCH); }
            else
              {
              if (VMPI_memcmp(eptr, occhars, oclength) != 0) RRETURN(MATCH_NOMATCH);
              eptr += oclength;
              }
  #else   /* without SUPPORT_UCP */
            else { RRETURN(MATCH_NOMATCH); }
  #endif  /* SUPPORT_UCP */
            }
  
          if (min == max) continue;
  
          if (minimize)
            {
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM22);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              if (VMPI_memcmp(eptr, charptr, length) == 0) eptr += length;
  #ifdef SUPPORT_UCP
              /* Need braces because of following else */
              else if (oclength == 0) { RRETURN(MATCH_NOMATCH); }
              else
                {
                if (VMPI_memcmp(eptr, occhars, oclength) != 0) RRETURN(MATCH_NOMATCH);
                eptr += oclength;
                }
  #else   /* without SUPPORT_UCP */
              else { RRETURN (MATCH_NOMATCH); }
  #endif  /* SUPPORT_UCP */
              }
            /* Control never gets here */
            }
  
          else  /* Maximize */
            {
            pp = eptr;
            for (i = min; i < max; i++)
              {
              if (eptr > md->end_subject - length) break;
              if (VMPI_memcmp(eptr, charptr, length) == 0) eptr += length;
  #ifdef SUPPORT_UCP
              else if (oclength == 0) break;
              else
                {
                if (VMPI_memcmp(eptr, occhars, oclength) != 0) break;
                eptr += oclength;
                }
  #else   /* without SUPPORT_UCP */
              else break;
  #endif  /* SUPPORT_UCP */
              }
  
            if (possessive) continue;
            for(;;)
             {
             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM23);
             if (rrc != MATCH_NOMATCH) RRETURN(rrc);
             if (eptr == pp) RRETURN(MATCH_NOMATCH);
  #ifdef SUPPORT_UCP
             eptr--;
             BACKCHAR(eptr);
  #else   /* without SUPPORT_UCP */
             eptr -= length;
  #endif  /* SUPPORT_UCP */
             }
            }
          /* Control never gets here */
          }
  
        /* If the length of a UTF-8 character is 1, we fall through here, and
        obey the code as for non-UTF-8 characters below, though in this case the
        value of fc will always be < 128. */
        }
      else
  #endif  /* SUPPORT_UTF8 */
  
      /* When not in UTF-8 mode, load a single-byte character. */
        {
        if (min > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);
        fc = *ecode++;
        }
  
      /* The value of fc at this point is always less than 256, though we may or
      may not be in UTF-8 mode. The code is duplicated for the caseless and
      caseful cases, for speed, since matching characters is likely to be quite
      common. First, ensure the minimum number of matches are present. If min =
      max, continue at the same level without recursing. Otherwise, if
      minimizing, keep trying the rest of the expression and advancing one
      matching character if failing, up to the maximum. Alternatively, if
      maximizing, find the maximum number of characters and work backwards. */
  
      DPRINTF(("matching %c{%d,%d} against subject %.*s\n", fc, min, max,
        max, eptr));
  
      if ((ims & PCRE_CASELESS) != 0)
        {
        fc = md->lcc[fc];
        for (i = 1; i <= min; i++)
          if (fc != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH);
        if (min == max) continue;
        if (minimize)
          {
          for (fi = min;; fi++)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM24);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max || eptr >= md->end_subject ||
                fc != md->lcc[*eptr++])
              RRETURN(MATCH_NOMATCH);
            }
          /* Control never gets here */
          }
        else  /* Maximize */
          {
          pp = eptr;
          for (i = min; i < max; i++)
            {
            if (eptr >= md->end_subject || fc != md->lcc[*eptr]) break;
            eptr++;
            }
          if (possessive) continue;
          while (eptr >= pp)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM25);
            eptr--;
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            }
          RRETURN(MATCH_NOMATCH);
          }
        /* Control never gets here */
        }
  
      /* Caseful comparisons (includes all multi-byte characters) */
  
      else
        {
        for (i = 1; i <= min; i++) if (fc != *eptr++) RRETURN(MATCH_NOMATCH);
        if (min == max) continue;
        if (minimize)
          {
          for (fi = min;; fi++)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM26);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max || eptr >= md->end_subject || fc != *eptr++)
              RRETURN(MATCH_NOMATCH);
            }
          /* Control never gets here */
          }
        else  /* Maximize */
          {
          pp = eptr;
          for (i = min; i < max; i++)
            {
            if (eptr >= md->end_subject || fc != *eptr) break;
            eptr++;
            }
          if (possessive) continue;
          while (eptr >= pp)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM27);
            eptr--;
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            }
          RRETURN(MATCH_NOMATCH);
          }
        }
      /* Control never gets here */
  
      /* Match a negated single one-byte character. The character we are
      checking can be multibyte. */
  
      case OP_NOT:
      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
      ecode++;
      GETCHARINCTEST(c, eptr);
      if ((ims & PCRE_CASELESS) != 0)
        {
  #ifdef SUPPORT_UTF8
        if (c < 256)
  #endif
        c = md->lcc[c];
        if (md->lcc[*ecode++] == c) RRETURN(MATCH_NOMATCH);
        }
      else
        {
        if (*ecode++ == c) RRETURN(MATCH_NOMATCH);
        }
      break;
  
      /* Match a negated single one-byte character repeatedly. This is almost a
      repeat of the code for a repeated single character, but I haven't found a
      nice way of commoning these up that doesn't require a test of the
      positive/negative option for each character match. Maybe that wouldn't add
      very much to the time taken, but character matching *is* what this is all
      about... */
  
      case OP_NOTEXACT:
      min = max = GET2(ecode, 1);
      ecode += 3;
      goto REPEATNOTCHAR;
  
      case OP_NOTUPTO:
      case OP_NOTMINUPTO:
      min = 0;
      max = GET2(ecode, 1);
      minimize = *ecode == OP_NOTMINUPTO;
      ecode += 3;
      goto REPEATNOTCHAR;
  
      case OP_NOTPOSSTAR:
      possessive = TRUE;
      min = 0;
      max = INT_MAX;
      ecode++;
      goto REPEATNOTCHAR;
  
      case OP_NOTPOSPLUS:
      possessive = TRUE;
      min = 1;
      max = INT_MAX;
      ecode++;
      goto REPEATNOTCHAR;
  
      case OP_NOTPOSQUERY:
      possessive = TRUE;
      min = 0;
      max = 1;
      ecode++;
      goto REPEATNOTCHAR;
  
      case OP_NOTPOSUPTO:
      possessive = TRUE;
      min = 0;
      max = GET2(ecode, 1);
      ecode += 3;
      goto REPEATNOTCHAR;
  
      case OP_NOTSTAR:
      case OP_NOTMINSTAR:
      case OP_NOTPLUS:
      case OP_NOTMINPLUS:
      case OP_NOTQUERY:
      case OP_NOTMINQUERY:
      c = *ecode++ - OP_NOTSTAR;
      minimize = (c & 1) != 0;
      min = rep_min[c];                 /* Pick up values from tables; */
      max = rep_max[c];                 /* zero for max => infinity */
      if (max == 0) max = INT_MAX;
  
      /* Common code for all repeated single-byte matches. We can give up quickly
      if there are fewer than the minimum number of bytes left in the
      subject. */
  
      REPEATNOTCHAR:
      if (min > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);
      fc = *ecode++;
  
      /* The code is duplicated for the caseless and caseful cases, for speed,
      since matching characters is likely to be quite common. First, ensure the
      minimum number of matches are present. If min = max, continue at the same
      level without recursing. Otherwise, if minimizing, keep trying the rest of
      the expression and advancing one matching character if failing, up to the
      maximum. Alternatively, if maximizing, find the maximum number of
      characters and work backwards. */
  
      DPRINTF(("negative matching %c{%d,%d} against subject %.*s\n", fc, min, max,
        max, eptr));
  
      if ((ims & PCRE_CASELESS) != 0)
        {
        fc = md->lcc[fc];
  
  #ifdef SUPPORT_UTF8
        /* UTF-8 mode */
        if (utf8)
          {
          register unsigned int d;
          for (i = 1; i <= min; i++)
            {
            GETCHARINC(d, eptr);
            if (d < 256) d = md->lcc[d];
            if (fc == d) RRETURN(MATCH_NOMATCH);
            }
          }
        else
  #endif
  
        /* Not UTF-8 mode */
          {
          for (i = 1; i <= min; i++)
            if (fc == md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH);
          }
  
        if (min == max) continue;
  
        if (minimize)
          {
  #ifdef SUPPORT_UTF8
          /* UTF-8 mode */
          if (utf8)
            {
            register unsigned int d;
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM28);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              GETCHARINC(d, eptr);
              if (d < 256) d = md->lcc[d];
              if (fi >= max || eptr >= md->end_subject || fc == d)
                RRETURN(MATCH_NOMATCH);
              }
            }
          else
  #endif
          /* Not UTF-8 mode */
            {
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM29);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject || fc == md->lcc[*eptr++])
                RRETURN(MATCH_NOMATCH);
              }
            }
          /* Control never gets here */
          }
  
        /* Maximize case */
  
        else
          {
          pp = eptr;
  
  #ifdef SUPPORT_UTF8
          /* UTF-8 mode */
          if (utf8)
            {
            register unsigned int d;
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(d, eptr, len);
              if (d < 256) d = md->lcc[d];
              if (fc == d) break;
              eptr += len;
              }
          if (possessive) continue;
          for(;;)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM30);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (eptr-- == pp) break;        /* Stop if tried at original pos */
              BACKCHAR(eptr);
              }
            }
          else
  #endif
          /* Not UTF-8 mode */
            {
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject || fc == md->lcc[*eptr]) break;
              eptr++;
              }
            if (possessive) continue;
            while (eptr >= pp)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM31);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              eptr--;
              }
            }
  
          RRETURN(MATCH_NOMATCH);
          }
        /* Control never gets here */
        }
  
      /* Caseful comparisons */
  
      else
        {
  #ifdef SUPPORT_UTF8
        /* UTF-8 mode */
        if (utf8)
          {
          register unsigned int d;
          for (i = 1; i <= min; i++)
            {
            GETCHARINC(d, eptr);
            if (fc == d) RRETURN(MATCH_NOMATCH);
            }
          }
        else
  #endif
        /* Not UTF-8 mode */
          {
          for (i = 1; i <= min; i++)
            if (fc == *eptr++) RRETURN(MATCH_NOMATCH);
          }
  
        if (min == max) continue;
  
        if (minimize)
          {
  #ifdef SUPPORT_UTF8
          /* UTF-8 mode */
          if (utf8)
            {
            register unsigned int d;
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM32);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              GETCHARINC(d, eptr);
              if (fi >= max || eptr >= md->end_subject || fc == d)
                RRETURN(MATCH_NOMATCH);
              }
            }
          else
  #endif
          /* Not UTF-8 mode */
            {
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM33);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject || fc == *eptr++)
                RRETURN(MATCH_NOMATCH);
              }
            }
          /* Control never gets here */
          }
  
        /* Maximize case */
  
        else
          {
          pp = eptr;
  
  #ifdef SUPPORT_UTF8
          /* UTF-8 mode */
          if (utf8)
            {
            register unsigned int d;
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(d, eptr, len);
              if (fc == d) break;
              eptr += len;
              }
            if (possessive) continue;
            for(;;)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM34);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (eptr-- == pp) break;        /* Stop if tried at original pos */
              BACKCHAR(eptr);
              }
            }
          else
  #endif
          /* Not UTF-8 mode */
            {
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject || fc == *eptr) break;
              eptr++;
              }
            if (possessive) continue;
            while (eptr >= pp)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM35);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              eptr--;
              }
            }
  
          RRETURN(MATCH_NOMATCH);
          }
        }
      /* Control never gets here */
  
      /* Match a single character type repeatedly; several different opcodes
      share code. This is very similar to the code for single characters, but we
      repeat it in the interests of efficiency. */
  
      case OP_TYPEEXACT:
      min = max = GET2(ecode, 1);
      minimize = TRUE;
      ecode += 3;
      goto REPEATTYPE;
  
      case OP_TYPEUPTO:
      case OP_TYPEMINUPTO:
      min = 0;
      max = GET2(ecode, 1);
      minimize = *ecode == OP_TYPEMINUPTO;
      ecode += 3;
      goto REPEATTYPE;
  
      case OP_TYPEPOSSTAR:
      possessive = TRUE;
      min = 0;
      max = INT_MAX;
      ecode++;
      goto REPEATTYPE;
  
      case OP_TYPEPOSPLUS:
      possessive = TRUE;
      min = 1;
      max = INT_MAX;
      ecode++;
      goto REPEATTYPE;
  
      case OP_TYPEPOSQUERY:
      possessive = TRUE;
      min = 0;
      max = 1;
      ecode++;
      goto REPEATTYPE;
  
      case OP_TYPEPOSUPTO:
      possessive = TRUE;
      min = 0;
      max = GET2(ecode, 1);
      ecode += 3;
      goto REPEATTYPE;
  
      case OP_TYPESTAR:
      case OP_TYPEMINSTAR:
      case OP_TYPEPLUS:
      case OP_TYPEMINPLUS:
      case OP_TYPEQUERY:
      case OP_TYPEMINQUERY:
      c = *ecode++ - OP_TYPESTAR;
      minimize = (c & 1) != 0;
      min = rep_min[c];                 /* Pick up values from tables; */
      max = rep_max[c];                 /* zero for max => infinity */
      if (max == 0) max = INT_MAX;
  
      /* Common code for all repeated single character type matches. Note that
      in UTF-8 mode, '.' matches a character of any length, but for the other
      character types, the valid characters are all one-byte long. */
  
      REPEATTYPE:
      ctype = *ecode++;      /* Code for the character type */
  
  #ifdef SUPPORT_UCP
      if (ctype == OP_PROP || ctype == OP_NOTPROP)
        {
        prop_fail_result = ctype == OP_NOTPROP;
        prop_type = *ecode++;
        prop_value = *ecode++;
        }
      else prop_type = -1;
  #endif
  
      /* First, ensure the minimum number of matches are present. Use inline
      code for maximizing the speed, and do the type test once at the start
      (i.e. keep it out of the loop). Also we can test that there are at least
      the minimum number of bytes before we start. This isn't as effective in
      UTF-8 mode, but it does no harm. Separate the UTF-8 code completely as that
      is tidier. Also separate the UCP code, which can be the same for both UTF-8
      and single-bytes. */
  
      if (min > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);
      if (min > 0)
        {
  #ifdef SUPPORT_UCP
        if (prop_type >= 0)
          {
          switch(prop_type)
            {
            case PT_ANY:
            if (prop_fail_result) RRETURN(MATCH_NOMATCH);
            for (i = 1; i <= min; i++)
              {
              if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINCTEST(c, eptr);
              }
            break;
  
            case PT_LAMP:
            for (i = 1; i <= min; i++)
              {
              if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINCTEST(c, eptr);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_chartype == ucp_Lu ||
                   prop_chartype == ucp_Ll ||
                   prop_chartype == ucp_Lt) == prop_fail_result)
                RRETURN(MATCH_NOMATCH);
              }
            break;
  
            case PT_GC:
            for (i = 1; i <= min; i++)
              {
              if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINCTEST(c, eptr);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_category == prop_value) == prop_fail_result)
                RRETURN(MATCH_NOMATCH);
              }
            break;
  
            case PT_PC:
            for (i = 1; i <= min; i++)
              {
              if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINCTEST(c, eptr);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_chartype == prop_value) == prop_fail_result)
                RRETURN(MATCH_NOMATCH);
              }
            break;
  
            case PT_SC:
            for (i = 1; i <= min; i++)
              {
              if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINCTEST(c, eptr);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_script == prop_value) == prop_fail_result)
                RRETURN(MATCH_NOMATCH);
              }
            break;
  
            default:
            RRETURN(PCRE_ERROR_INTERNAL);
            }
          }
  
        /* Match extended Unicode sequences. We will get here only if the
        support is in the binary; otherwise a compile-time error occurs. */
  
        else if (ctype == OP_EXTUNI)
          {
          for (i = 1; i <= min; i++)
            {
            GETCHARINCTEST(c, eptr);
            prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
            if (prop_category == ucp_M) RRETURN(MATCH_NOMATCH);
            while (eptr < md->end_subject)
              {
              int len = 1;
              if (!utf8) c = *eptr; else
                {
                GETCHARLEN(c, eptr, len);
                }
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if (prop_category != ucp_M) break;
              eptr += len;
              }
            }
          }
  
        else
  #endif     /* SUPPORT_UCP */
  
  /* Handle all other cases when the coding is UTF-8 */
  
  #ifdef SUPPORT_UTF8
        if (utf8) switch(ctype)
          {
          case OP_ANY:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject ||
                 ((ims & PCRE_DOTALL) == 0 && IS_NEWLINE(eptr)))
              RRETURN(MATCH_NOMATCH);
            eptr++;
            while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;
            }
          break;
  
          case OP_ANYBYTE:
          eptr += min;
          break;
  
          case OP_ANYNL:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINC(c, eptr);
            switch(c)
              {
              default: RRETURN(MATCH_NOMATCH);
              case 0x000d:
              if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
              break;
              case 0x000a:
              case 0x000b:
              case 0x000c:
              case 0x0085:
              case 0x2028:
              case 0x2029:
              break;
              }
            }
          break;
  
          case OP_NOT_HSPACE:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINC(c, eptr);
            switch(c)
              {
              default: break;
              case 0x09:      /* HT */
              case 0x20:      /* SPACE */
              case 0xa0:      /* NBSP */
              case 0x1680:    /* OGHAM SPACE MARK */
              case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */
              case 0x2000:    /* EN QUAD */
              case 0x2001:    /* EM QUAD */
              case 0x2002:    /* EN SPACE */
              case 0x2003:    /* EM SPACE */
              case 0x2004:    /* THREE-PER-EM SPACE */
              case 0x2005:    /* FOUR-PER-EM SPACE */
              case 0x2006:    /* SIX-PER-EM SPACE */
              case 0x2007:    /* FIGURE SPACE */
              case 0x2008:    /* PUNCTUATION SPACE */
              case 0x2009:    /* THIN SPACE */
              case 0x200A:    /* HAIR SPACE */
              case 0x202f:    /* NARROW NO-BREAK SPACE */
              case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */
              case 0x3000:    /* IDEOGRAPHIC SPACE */
              RRETURN(MATCH_NOMATCH);
              }
            }
          break;
  
          case OP_HSPACE:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINC(c, eptr);
            switch(c)
              {
              default: RRETURN(MATCH_NOMATCH);
              case 0x09:      /* HT */
              case 0x20:      /* SPACE */
              case 0xa0:      /* NBSP */
              case 0x1680:    /* OGHAM SPACE MARK */
              case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */
              case 0x2000:    /* EN QUAD */
              case 0x2001:    /* EM QUAD */
              case 0x2002:    /* EN SPACE */
              case 0x2003:    /* EM SPACE */
              case 0x2004:    /* THREE-PER-EM SPACE */
              case 0x2005:    /* FOUR-PER-EM SPACE */
              case 0x2006:    /* SIX-PER-EM SPACE */
              case 0x2007:    /* FIGURE SPACE */
              case 0x2008:    /* PUNCTUATION SPACE */
              case 0x2009:    /* THIN SPACE */
              case 0x200A:    /* HAIR SPACE */
              case 0x202f:    /* NARROW NO-BREAK SPACE */
              case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */
              case 0x3000:    /* IDEOGRAPHIC SPACE */
              break;
              }
            }
          break;
  
          case OP_NOT_VSPACE:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINC(c, eptr);
            switch(c)
              {
              default: break;
              case 0x0a:      /* LF */
              case 0x0b:      /* VT */
              case 0x0c:      /* FF */
              case 0x0d:      /* CR */
              case 0x85:      /* NEL */
              case 0x2028:    /* LINE SEPARATOR */
              case 0x2029:    /* PARAGRAPH SEPARATOR */
              RRETURN(MATCH_NOMATCH);
              }
            }
          break;
  
          case OP_VSPACE:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINC(c, eptr);
            switch(c)
              {
              default: RRETURN(MATCH_NOMATCH);
              case 0x0a:      /* LF */
              case 0x0b:      /* VT */
              case 0x0c:      /* FF */
              case 0x0d:      /* CR */
              case 0x85:      /* NEL */
              case 0x2028:    /* LINE SEPARATOR */
              case 0x2029:    /* PARAGRAPH SEPARATOR */
              break;
              }
            }
          break;
  
          case OP_NOT_DIGIT:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINC(c, eptr);
            if (c < 128 && (md->ctypes[c] & ctype_digit) != 0)
              RRETURN(MATCH_NOMATCH);
            }
          break;
  
          case OP_DIGIT:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject ||
               *eptr >= 128 || (md->ctypes[*eptr++] & ctype_digit) == 0)
              RRETURN(MATCH_NOMATCH);
            /* No need to skip more bytes - we know it's a 1-byte character */
            }
          break;
  
          case OP_NOT_WHITESPACE:
          for (i = 1; i <= min; i++)
            {
  			if (eptr >= md->end_subject)
  				RRETURN(MATCH_NOMATCH);
  			if (*eptr < 128)
  			{
  				if ((md->ctypes[*eptr] & ctype_space) != 0)
  					RRETURN(MATCH_NOMATCH);
  			}
  			else 
  			{
  				int d;
     				GETCHARINC(d, eptr);
  				if (isUnicodeWhiteSpace(d) == true)
     				{
              RRETURN(MATCH_NOMATCH);
     				}
  			}
            while (++eptr < md->end_subject && (*eptr & 0xc0) == 0x80){}
            }
          break;
  
          case OP_WHITESPACE:
          for (i = 1; i <= min; i++)
            {
  			if (eptr >= md->end_subject)
  			{
  				RRETURN(MATCH_NOMATCH);
  			}
  			if (*eptr < 128)
  			{
  				if ((md->ctypes[*eptr++] & ctype_space) == 0)
  					RRETURN(MATCH_NOMATCH);
  			}
  			else 
  			{
  				int d;
     				GETCHARINC(d, eptr);
  				if (isUnicodeWhiteSpace(d) == false)
     				{
              RRETURN(MATCH_NOMATCH);
     				}
  			}
            }
          break;
  
          case OP_NOT_WORDCHAR:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject ||
               (*eptr < 128 && (md->ctypes[*eptr] & ctype_word) != 0))
              RRETURN(MATCH_NOMATCH);
            while (++eptr < md->end_subject && (*eptr & 0xc0) == 0x80){}
            }
          break;
  
          case OP_WORDCHAR:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject ||
               *eptr >= 128 || (md->ctypes[*eptr++] & ctype_word) == 0)
              RRETURN(MATCH_NOMATCH);
            /* No need to skip more bytes - we know it's a 1-byte character */
            }
          break;
  
          default:
          RRETURN(PCRE_ERROR_INTERNAL);
          }  /* End switch(ctype) */
  
        else
  #endif     /* SUPPORT_UTF8 */
  
        /* Code for the non-UTF-8 case for minimum matching of operators other
        than OP_PROP and OP_NOTPROP. We can assume that there are the minimum
        number of bytes present, as this was tested above. */
  
        switch(ctype)
          {
          case OP_ANY:
          if ((ims & PCRE_DOTALL) == 0)
            {
            for (i = 1; i <= min; i++)
              {
              if (IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH);
              eptr++;
              }
            }
          else eptr += min;
          break;
  
          case OP_ANYBYTE:
          eptr += min;
          break;
  
          /* Because of the CRLF case, we can't assume the minimum number of
          bytes are present in this case. */
  
          case OP_ANYNL:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            switch(*eptr++)
              {
              default: RRETURN(MATCH_NOMATCH);
              case 0x000d:
              if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
              break;
              case 0x000a:
              case 0x000b:
              case 0x000c:
              case 0x0085:
              break;
              }
            }
          break;
  
          case OP_NOT_HSPACE:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            switch(*eptr++)
              {
              default: break;
              case 0x09:      /* HT */
              case 0x20:      /* SPACE */
              case 0xa0:      /* NBSP */
              RRETURN(MATCH_NOMATCH);
              }
            }
          break;
  
          case OP_HSPACE:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            switch(*eptr++)
              {
              default: RRETURN(MATCH_NOMATCH);
              case 0x09:      /* HT */
              case 0x20:      /* SPACE */
              case 0xa0:      /* NBSP */
              break;
              }
            }
          break;
  
          case OP_NOT_VSPACE:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            switch(*eptr++)
              {
              default: break;
              case 0x0a:      /* LF */
              case 0x0b:      /* VT */
              case 0x0c:      /* FF */
              case 0x0d:      /* CR */
              case 0x85:      /* NEL */
              RRETURN(MATCH_NOMATCH);
              }
            }
          break;
  
          case OP_VSPACE:
          for (i = 1; i <= min; i++)
            {
            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            switch(*eptr++)
              {
              default: RRETURN(MATCH_NOMATCH);
              case 0x0a:      /* LF */
              case 0x0b:      /* VT */
              case 0x0c:      /* FF */
              case 0x0d:      /* CR */
              case 0x85:      /* NEL */
              break;
              }
            }
          break;
  
          case OP_NOT_DIGIT:
          for (i = 1; i <= min; i++)
            if ((md->ctypes[*eptr++] & ctype_digit) != 0) RRETURN(MATCH_NOMATCH);
          break;
  
          case OP_DIGIT:
          for (i = 1; i <= min; i++)
            if ((md->ctypes[*eptr++] & ctype_digit) == 0) RRETURN(MATCH_NOMATCH);
          break;
  
          case OP_NOT_WHITESPACE: // cn: no need for isUnicodeWhiteSpace() checks, this is the non-utf8 #ifdef'd code
          for (i = 1; i <= min; i++)
            if ((md->ctypes[*eptr++] & ctype_space) != 0) RRETURN(MATCH_NOMATCH);
          break;
  
          case OP_WHITESPACE: // cn: no need for isUnicodeWhiteSpace() checks, this is the non-utf8 #ifdef'd code
          for (i = 1; i <= min; i++)
            if ((md->ctypes[*eptr++] & ctype_space) == 0) RRETURN(MATCH_NOMATCH);
          break;
  
          case OP_NOT_WORDCHAR:
          for (i = 1; i <= min; i++)
            if ((md->ctypes[*eptr++] & ctype_word) != 0)
              RRETURN(MATCH_NOMATCH);
          break;
  
          case OP_WORDCHAR:
          for (i = 1; i <= min; i++)
            if ((md->ctypes[*eptr++] & ctype_word) == 0)
              RRETURN(MATCH_NOMATCH);
          break;
  
          default:
          RRETURN(PCRE_ERROR_INTERNAL);
          }
        }
  
      /* If min = max, continue at the same level without recursing */
  
      if (min == max) continue;
  
      /* If minimizing, we have to test the rest of the pattern before each
      subsequent match. Again, separate the UTF-8 case for speed, and also
      separate the UCP cases. */
  
      if (minimize)
        {
  #ifdef SUPPORT_UCP
        if (prop_type >= 0)
          {
          switch(prop_type)
            {
            case PT_ANY:
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM36);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINC(c, eptr);
              if (prop_fail_result) RRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
  
            case PT_LAMP:
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM37);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINC(c, eptr);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_chartype == ucp_Lu ||
                   prop_chartype == ucp_Ll ||
                   prop_chartype == ucp_Lt) == prop_fail_result)
                RRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
  
            case PT_GC:
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM38);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINC(c, eptr);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_category == prop_value) == prop_fail_result)
                RRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
  
            case PT_PC:
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM39);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINC(c, eptr);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_chartype == prop_value) == prop_fail_result)
                RRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
  
            case PT_SC:
            for (fi = min;; fi++)
              {
              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM40);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
              GETCHARINC(c, eptr);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_script == prop_value) == prop_fail_result)
                RRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
  
            default:
            RRETURN(PCRE_ERROR_INTERNAL);
            }
          }
  
        /* Match extended Unicode sequences. We will get here only if the
        support is in the binary; otherwise a compile-time error occurs. */
  
        else if (ctype == OP_EXTUNI)
          {
          for (fi = min;; fi++)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM41);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);
            GETCHARINCTEST(c, eptr);
            prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
            if (prop_category == ucp_M) RRETURN(MATCH_NOMATCH);
            while (eptr < md->end_subject)
              {
              int len = 1;
              if (!utf8) c = *eptr; else
                {
                GETCHARLEN(c, eptr, len);
                }
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if (prop_category != ucp_M) break;
              eptr += len;
              }
            }
          }
  
        else
  #endif     /* SUPPORT_UCP */
  
  #ifdef SUPPORT_UTF8
        /* UTF-8 mode */
        if (utf8)
          {
          for (fi = min;; fi++)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM42);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max || eptr >= md->end_subject ||
                 (ctype == OP_ANY && (ims & PCRE_DOTALL) == 0 &&
                  IS_NEWLINE(eptr)))
              RRETURN(MATCH_NOMATCH);
  
            GETCHARINC(c, eptr);
            switch(ctype)
              {
              case OP_ANY:        /* This is the DOTALL case */
              break;
  
              case OP_ANYBYTE:
              break;
  
              case OP_ANYNL:
              switch(c)
                {
                default: RRETURN(MATCH_NOMATCH);
                case 0x000d:
                if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
                break;
                case 0x000a:
                case 0x000b:
                case 0x000c:
                case 0x0085:
                case 0x2028:
                case 0x2029:
                break;
                }
              break;
  
              case OP_NOT_HSPACE:
              switch(c)
                {
                default: break;
                case 0x09:      /* HT */
                case 0x20:      /* SPACE */
                case 0xa0:      /* NBSP */
                case 0x1680:    /* OGHAM SPACE MARK */
                case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */
                case 0x2000:    /* EN QUAD */
                case 0x2001:    /* EM QUAD */
                case 0x2002:    /* EN SPACE */
                case 0x2003:    /* EM SPACE */
                case 0x2004:    /* THREE-PER-EM SPACE */
                case 0x2005:    /* FOUR-PER-EM SPACE */
                case 0x2006:    /* SIX-PER-EM SPACE */
                case 0x2007:    /* FIGURE SPACE */
                case 0x2008:    /* PUNCTUATION SPACE */
                case 0x2009:    /* THIN SPACE */
                case 0x200A:    /* HAIR SPACE */
                case 0x202f:    /* NARROW NO-BREAK SPACE */
                case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */
                case 0x3000:    /* IDEOGRAPHIC SPACE */
                RRETURN(MATCH_NOMATCH);
                }
              break;
  
              case OP_HSPACE:
              switch(c)
                {
                default: RRETURN(MATCH_NOMATCH);
                case 0x09:      /* HT */
                case 0x20:      /* SPACE */
                case 0xa0:      /* NBSP */
                case 0x1680:    /* OGHAM SPACE MARK */
                case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */
                case 0x2000:    /* EN QUAD */
                case 0x2001:    /* EM QUAD */
                case 0x2002:    /* EN SPACE */
                case 0x2003:    /* EM SPACE */
                case 0x2004:    /* THREE-PER-EM SPACE */
                case 0x2005:    /* FOUR-PER-EM SPACE */
                case 0x2006:    /* SIX-PER-EM SPACE */
                case 0x2007:    /* FIGURE SPACE */
                case 0x2008:    /* PUNCTUATION SPACE */
                case 0x2009:    /* THIN SPACE */
                case 0x200A:    /* HAIR SPACE */
                case 0x202f:    /* NARROW NO-BREAK SPACE */
                case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */
                case 0x3000:    /* IDEOGRAPHIC SPACE */
                break;
                }
              break;
  
              case OP_NOT_VSPACE:
              switch(c)
                {
                default: break;
                case 0x0a:      /* LF */
                case 0x0b:      /* VT */
                case 0x0c:      /* FF */
                case 0x0d:      /* CR */
                case 0x85:      /* NEL */
                case 0x2028:    /* LINE SEPARATOR */
                case 0x2029:    /* PARAGRAPH SEPARATOR */
                RRETURN(MATCH_NOMATCH);
                }
              break;
  
              case OP_VSPACE:
              switch(c)
                {
                default: RRETURN(MATCH_NOMATCH);
                case 0x0a:      /* LF */
                case 0x0b:      /* VT */
                case 0x0c:      /* FF */
                case 0x0d:      /* CR */
                case 0x85:      /* NEL */
                case 0x2028:    /* LINE SEPARATOR */
                case 0x2029:    /* PARAGRAPH SEPARATOR */
                break;
                }
              break;
  
              case OP_NOT_DIGIT:
              if (c < 256 && (md->ctypes[c] & ctype_digit) != 0)
                RRETURN(MATCH_NOMATCH);
              break;
  
              case OP_DIGIT:
              if (c >= 256 || (md->ctypes[c] & ctype_digit) == 0)
                RRETURN(MATCH_NOMATCH);
              break;
  
              case OP_NOT_WHITESPACE:
     			if (c < 256)
  			{
  				if ((md->ctypes[c] & ctype_space) != 0)
  					RRETURN(MATCH_NOMATCH);
  			}
              else if (isUnicodeWhiteSpace(c) == true)
  			{
                RRETURN(MATCH_NOMATCH);
  			}
              break;
  
              case OP_WHITESPACE:
     			if (c < 256)
  			{
  				if ((md->ctypes[c] & ctype_space) == 0)
                RRETURN(MATCH_NOMATCH);
  			}
              else if (isUnicodeWhiteSpace(c) == false)
  			{
    				RRETURN(MATCH_NOMATCH);
  			}
              break;
  
              case OP_NOT_WORDCHAR:
              if (c < 256 && (md->ctypes[c] & ctype_word) != 0)
                RRETURN(MATCH_NOMATCH);
              break;
  
              case OP_WORDCHAR:
              if (c >= 256 || (md->ctypes[c] & ctype_word) == 0)
                RRETURN(MATCH_NOMATCH);
              break;
  
              default:
              RRETURN(PCRE_ERROR_INTERNAL);
              }
            }
          }
        else
  #endif
        /* Not UTF-8 mode */
          {
          for (fi = min;; fi++)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM43);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max || eptr >= md->end_subject ||
                 ((ims & PCRE_DOTALL) == 0 && IS_NEWLINE(eptr)))
              RRETURN(MATCH_NOMATCH);
  
            c = *eptr++;
            switch(ctype)
              {
              case OP_ANY:   /* This is the DOTALL case */
              break;
  
              case OP_ANYBYTE:
              break;
  
              case OP_ANYNL:
              switch(c)
                {
                default: RRETURN(MATCH_NOMATCH);
                case 0x000d:
                if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
                break;
                case 0x000a:
                case 0x000b:
                case 0x000c:
                case 0x0085:
                break;
                }
              break;
  
              case OP_NOT_HSPACE:
              switch(c)
                {
                default: break;
                case 0x09:      /* HT */
                case 0x20:      /* SPACE */
                case 0xa0:      /* NBSP */
                RRETURN(MATCH_NOMATCH);
                }
              break;
  
              case OP_HSPACE:
              switch(c)
                {
                default: RRETURN(MATCH_NOMATCH);
                case 0x09:      /* HT */
                case 0x20:      /* SPACE */
                case 0xa0:      /* NBSP */
                break;
                }
              break;
  
              case OP_NOT_VSPACE:
              switch(c)
                {
                default: break;
                case 0x0a:      /* LF */
                case 0x0b:      /* VT */
                case 0x0c:      /* FF */
                case 0x0d:      /* CR */
                case 0x85:      /* NEL */
                RRETURN(MATCH_NOMATCH);
                }
              break;
  
              case OP_VSPACE:
              switch(c)
                {
                default: RRETURN(MATCH_NOMATCH);
                case 0x0a:      /* LF */
                case 0x0b:      /* VT */
                case 0x0c:      /* FF */
                case 0x0d:      /* CR */
                case 0x85:      /* NEL */
                break;
                }
              break;
  
              case OP_NOT_DIGIT:
              if ((md->ctypes[c] & ctype_digit) != 0) RRETURN(MATCH_NOMATCH);
              break;
  
              case OP_DIGIT:
              if ((md->ctypes[c] & ctype_digit) == 0) RRETURN(MATCH_NOMATCH);
              break;
  
              case OP_NOT_WHITESPACE:
      		if (c < 256)
  			{
  				if ((md->ctypes[c] & ctype_space) != 0) 
  					RRETURN(MATCH_NOMATCH);
  			}
  			else if (isUnicodeWhiteSpace(c) == true)
  			{
    				RRETURN(MATCH_NOMATCH);
  			}
              break;
  
              case OP_WHITESPACE:
              if (c < 256)
  			{
  				if ((md->ctypes[c] & ctype_space) == 0) 
  					RRETURN(MATCH_NOMATCH);
  			}
  			else if (isUnicodeWhiteSpace(c) == false)
  			{
    				RRETURN(MATCH_NOMATCH);
  			}
              break;
  
              case OP_NOT_WORDCHAR:
              if ((md->ctypes[c] & ctype_word) != 0) RRETURN(MATCH_NOMATCH);
              break;
  
              case OP_WORDCHAR:
              if ((md->ctypes[c] & ctype_word) == 0) RRETURN(MATCH_NOMATCH);
              break;
  
              default:
              RRETURN(PCRE_ERROR_INTERNAL);
              }
            }
          }
        /* Control never gets here */
        }
  
      /* If maximizing, it is worth using inline code for speed, doing the type
      test once at the start (i.e. keep it out of the loop). Again, keep the
      UTF-8 and UCP stuff separate. */
  
      else
        {
        pp = eptr;  /* Remember where we started */
  
  #ifdef SUPPORT_UCP
        if (prop_type >= 0)
          {
          switch(prop_type)
            {
            case PT_ANY:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              if (prop_fail_result) break;
              eptr+= len;
              }
            break;
  
            case PT_LAMP:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_chartype == ucp_Lu ||
                   prop_chartype == ucp_Ll ||
                   prop_chartype == ucp_Lt) == prop_fail_result)
                break;
              eptr+= len;
              }
            break;
  
            case PT_GC:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_category == prop_value) == prop_fail_result)
                break;
              eptr+= len;
              }
            break;
  
            case PT_PC:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_chartype == prop_value) == prop_fail_result)
                break;
              eptr+= len;
              }
            break;
  
            case PT_SC:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if ((prop_script == prop_value) == prop_fail_result)
                break;
              eptr+= len;
              }
            break;
            }
  
          /* eptr is now past the end of the maximum run */
  
          if (possessive) continue;
          for(;;)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM44);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (eptr-- == pp) break;        /* Stop if tried at original pos */
            if (utf8) BACKCHAR(eptr);
            }
          }
  
        /* Match extended Unicode sequences. We will get here only if the
        support is in the binary; otherwise a compile-time error occurs. */
  
        else if (ctype == OP_EXTUNI)
          {
          for (i = min; i < max; i++)
            {
            if (eptr >= md->end_subject) break;
            GETCHARINCTEST(c, eptr);
            prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
            if (prop_category == ucp_M) break;
            while (eptr < md->end_subject)
              {
              int len = 1;
              if (!utf8) c = *eptr; else
                {
                GETCHARLEN(c, eptr, len);
                }
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if (prop_category != ucp_M) break;
              eptr += len;
              }
            }
  
          /* eptr is now past the end of the maximum run */
  
          if (possessive) continue;
          for(;;)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM45);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (eptr-- == pp) break;        /* Stop if tried at original pos */
            for (;;)                        /* Move back over one extended */
              {
              int len = 1;
              if (!utf8) c = *eptr; else
                {
                BACKCHAR(eptr);
                GETCHARLEN(c, eptr, len);
                }
              prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script);
              if (prop_category != ucp_M) break;
              eptr--;
              }
            }
          }
  
        else
  #endif   /* SUPPORT_UCP */
  
  #ifdef SUPPORT_UTF8
        /* UTF-8 mode */
  
        if (utf8)
          {
          switch(ctype)
            {
            case OP_ANY:
            if (max < INT_MAX)
              {
              if ((ims & PCRE_DOTALL) == 0)
                {
                for (i = min; i < max; i++)
                  {
                  if (eptr >= md->end_subject || IS_NEWLINE(eptr)) break;
                  eptr++;
                  while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;
                  }
                }
              else
                {
                for (i = min; i < max; i++)
                  {
                  if (eptr >= md->end_subject) break;
                  eptr++;
                  while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;
                  }
                }
              }
  
            /* Handle unlimited UTF-8 repeat */
  
            else
              {
              if ((ims & PCRE_DOTALL) == 0)
                {
                for (i = min; i < max; i++)
                  {
                  if (eptr >= md->end_subject || IS_NEWLINE(eptr)) break;
                  eptr++;
                  while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;
                  }
                }
              else
                {
                eptr = md->end_subject;
                }
              }
            break;
  
            /* The byte case is the same as non-UTF8 */
  
            case OP_ANYBYTE:
            c = max - min;
            if (c > (unsigned int)(md->end_subject - eptr))
              c = md->end_subject - eptr;
            eptr += c;
            break;
  
            case OP_ANYNL:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              if (c == 0x000d)
                {
                if (++eptr >= md->end_subject) break;
                if (*eptr == 0x000a) eptr++;
                }
              else
                {
                if (c != 0x000a && c != 0x000b && c != 0x000c &&
                    c != 0x0085 && c != 0x2028 && c != 0x2029)
                  break;
                eptr += len;
                }
              }
            break;
  
            case OP_NOT_HSPACE:
            case OP_HSPACE:
            for (i = min; i < max; i++)
              {
              BOOL gotspace;
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              switch(c)
                {
                default: gotspace = FALSE; break;
                case 0x09:      /* HT */
                case 0x20:      /* SPACE */
                case 0xa0:      /* NBSP */
                case 0x1680:    /* OGHAM SPACE MARK */
                case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */
                case 0x2000:    /* EN QUAD */
                case 0x2001:    /* EM QUAD */
                case 0x2002:    /* EN SPACE */
                case 0x2003:    /* EM SPACE */
                case 0x2004:    /* THREE-PER-EM SPACE */
                case 0x2005:    /* FOUR-PER-EM SPACE */
                case 0x2006:    /* SIX-PER-EM SPACE */
                case 0x2007:    /* FIGURE SPACE */
                case 0x2008:    /* PUNCTUATION SPACE */
                case 0x2009:    /* THIN SPACE */
                case 0x200A:    /* HAIR SPACE */
                case 0x202f:    /* NARROW NO-BREAK SPACE */
                case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */
                case 0x3000:    /* IDEOGRAPHIC SPACE */
                gotspace = TRUE;
                break;
                }
              if (gotspace == (ctype == OP_NOT_HSPACE)) break;
              eptr += len;
              }
            break;
  
            case OP_NOT_VSPACE:
            case OP_VSPACE:
            for (i = min; i < max; i++)
              {
              BOOL gotspace;
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              switch(c)
                {
                default: gotspace = FALSE; break;
                case 0x0a:      /* LF */
                case 0x0b:      /* VT */
                case 0x0c:      /* FF */
                case 0x0d:      /* CR */
                case 0x85:      /* NEL */
                case 0x2028:    /* LINE SEPARATOR */
                case 0x2029:    /* PARAGRAPH SEPARATOR */
                gotspace = TRUE;
                break;
                }
              if (gotspace == (ctype == OP_NOT_VSPACE)) break;
              eptr += len;
              }
            break;
  
            case OP_NOT_DIGIT:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              if (c < 256 && (md->ctypes[c] & ctype_digit) != 0) break;
              eptr+= len;
              }
            break;
  
            case OP_DIGIT:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              if (c >= 256 ||(md->ctypes[c] & ctype_digit) == 0) break;
              eptr+= len;
              }
            break;
  
            case OP_NOT_WHITESPACE:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
     			if (c < 256)
  			{
  				if ((md->ctypes[c] & ctype_space) != 0)
  					break;
  			}
  			else if (isUnicodeWhiteSpace(c) == true)
  			{		
  				break;
  			}
              eptr+= len;
              }
            break;
  
            case OP_WHITESPACE:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) 
  				break;
              GETCHARLEN(c, eptr, len);
  			if (c < 256)
  			{
  				if ((md->ctypes[c] & ctype_space) == 0)
  					break;
  			}
  			else if (isUnicodeWhiteSpace(c) == false)
  			{	
  				break;
  			}
              eptr+= len;
              }
            break;
  
            case OP_NOT_WORDCHAR:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              if (c < 256 && (md->ctypes[c] & ctype_word) != 0) break;
              eptr+= len;
              }
            break;
  
            case OP_WORDCHAR:
            for (i = min; i < max; i++)
              {
              int len = 1;
              if (eptr >= md->end_subject) break;
              GETCHARLEN(c, eptr, len);
              if (c >= 256 || (md->ctypes[c] & ctype_word) == 0) break;
              eptr+= len;
              }
            break;
  
            default:
            RRETURN(PCRE_ERROR_INTERNAL);
            }
  
          /* eptr is now past the end of the maximum run */
  
          if (possessive) continue;
          for(;;)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM46);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (eptr-- == pp) break;        /* Stop if tried at original pos */
            BACKCHAR(eptr);
            }
          }
        else
  #endif  /* SUPPORT_UTF8 */
  
        /* Not UTF-8 mode */
          {
          switch(ctype)
            {
            case OP_ANY:
            if ((ims & PCRE_DOTALL) == 0)
              {
              for (i = min; i < max; i++)
                {
                if (eptr >= md->end_subject || IS_NEWLINE(eptr)) break;
                eptr++;
                }
              break;
              }
            /* For DOTALL case, fall through and treat as \C */
  
            case OP_ANYBYTE:
            c = max - min;
            if (c > (unsigned int)(md->end_subject - eptr))
              c = md->end_subject - eptr;
            eptr += c;
            break;
  
            case OP_ANYNL:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject) break;
              c = *eptr;
              if (c == 0x000d)
                {
                if (++eptr >= md->end_subject) break;
                if (*eptr == 0x000a) eptr++;
                }
              else
                {
                if (c != 0x000a && c != 0x000b && c != 0x000c && c != 0x0085)
                  break;
                eptr++;
                }
              }
            break;
  
            case OP_NOT_HSPACE:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject) break;
              c = *eptr;
              if (c == 0x09 || c == 0x20 || c == 0xa0) break;
              eptr++;
              }
            break;
  
            case OP_HSPACE:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject) break;
              c = *eptr;
              if (c != 0x09 && c != 0x20 && c != 0xa0) break;
              eptr++;
              }
            break;
  
            case OP_NOT_VSPACE:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject) break;
              c = *eptr;
              if (c == 0x0a || c == 0x0b || c == 0x0c || c == 0x0d || c == 0x85)
                break;
              eptr++;
              }
            break;
  
            case OP_VSPACE:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject) break;
              c = *eptr;
              if (c != 0x0a && c != 0x0b && c != 0x0c && c != 0x0d && c != 0x85)
                break;
              eptr++;
              }
            break;
  
            case OP_NOT_DIGIT:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_digit) != 0)
                break;
              eptr++;
              }
            break;
  
            case OP_DIGIT:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_digit) == 0)
                break;
              eptr++;
              }
            break;
  
            case OP_NOT_WHITESPACE: // cn: not in the utf-8 #define, so no need to check isUnicodeWhiteSpace()
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_space) != 0)
                break;
              eptr++;
              }
            break;
  
            case OP_WHITESPACE: // cn: not in the utf-8 #define, so no need to check isUnicodeWhiteSpace()
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_space) == 0)
                break;
              eptr++;
              }
            break;
  
            case OP_NOT_WORDCHAR:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_word) != 0)
                break;
              eptr++;
              }
            break;
  
            case OP_WORDCHAR:
            for (i = min; i < max; i++)
              {
              if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_word) == 0)
                break;
              eptr++;
              }
            break;
  
            default:
            RRETURN(PCRE_ERROR_INTERNAL);
            }
  
          /* eptr is now past the end of the maximum run */
  
          if (possessive) continue;
          while (eptr >= pp)
            {
            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM47);
            eptr--;
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            }
          }
  
        /* Get here if we can't make it match with any permitted repetitions */
  
        RRETURN(MATCH_NOMATCH);
        }
      /* Control never gets here */
  
      /* There's been some horrible disaster. Arrival here can only mean there is
      something seriously wrong in the code above or the OP_xxx definitions. */
  
      default:
      DPRINTF(("Unknown opcode %d\n", *ecode));
      RRETURN(PCRE_ERROR_UNKNOWN_OPCODE);
      }
  
    /* Do not stick any code in here without much thought; it is assumed
    that "continue" in the code above comes out to here to repeat the main
    loop. */
  
    }             /* End of main loop */
  /* Control never reaches here */
  
  
  /* When compiling to use the heap rather than the stack for recursive calls to
  match(), the RRETURN() macro jumps here. The number that is saved in
  frame->Xwhere indicates which label we actually want to return to. */
  
  #ifdef NO_RECURSE
  #define LBL(val) case val: goto L_RM##val;
  HEAP_RETURN:
  switch (frame->Xwhere)
    {
    LBL( 1) LBL( 2) LBL( 3) LBL( 4) LBL( 5) LBL( 6) LBL( 7) LBL( 8)
    LBL( 9) LBL(10) LBL(11) LBL(12) LBL(13) LBL(14) LBL(15) LBL(16)
    LBL(17) LBL(18) LBL(19) LBL(20) LBL(21) LBL(22) LBL(23) LBL(24)
    LBL(25) LBL(26) LBL(27) LBL(28) LBL(29) LBL(30) LBL(31) LBL(32)
    LBL(33) LBL(34) LBL(35) 
        #ifdef SUPPORT_UCP
        LBL(36) LBL(37) LBL(38) LBL(39) LBL(40) LBL(41) 
        #endif
    LBL(42) LBL(43) 
        #ifdef SUPPORT_UCP
        LBL(44) LBL(45) 
        #endif
    LBL(46) LBL(47) LBL(48)  LBL(49) LBL(50) LBL(51) LBL(52) LBL(53)
    LBL(54)
    default:
    DPRINTF(("jump error in pcre match: label %d non-existent\n", frame->Xwhere));
    return PCRE_ERROR_INTERNAL;
    }
  #undef LBL
  #endif  /* NO_RECURSE */
  }
  
  
  /***************************************************************************
  ****************************************************************************
                     RECURSION IN THE match() FUNCTION
  
  Undefine all the macros that were defined above to handle this. */
  
  #ifdef NO_RECURSE
  #undef eptr
  #undef ecode
  #undef mstart
  #undef offset_top
  #undef ims
  #undef eptrb
  #undef flags
  
  #undef callpat
  #undef charptr
  #undef data
  #undef next
  #undef pp
  #undef prev
  #undef saved_eptr
  
  #undef new_recursive
  
  #undef cur_is_word
  #undef condition
  #undef prev_is_word
  
  #undef original_ims
  
  #undef ctype
  #undef length
  #undef max
  #undef min
  #undef number
  #undef offset
  #undef op
  #undef save_capture_last
  #undef save_offset1
  #undef save_offset2
  #undef save_offset3
  #undef stacksave
  
  #undef newptrb
  
  #endif
  
  /* These two are defined as macros in both cases */
  
  #undef fc
  #undef fi
  
  /***************************************************************************
  ***************************************************************************/
  
  
  
  /*************************************************
  *         Execute a Regular Expression           *
  *************************************************/
  
  /* This function applies a compiled re to a subject string and picks out
  portions of the string if it matches. Two elements in the vector are set for
  each substring: the offsets to the start and end of the substring.
  
  Arguments:
    argument_re     points to the compiled expression
    extra_data      points to extra data or is NULL
    subject         points to the subject string
    length          length of subject string (may contain binary zeros)
    start_offset    where to start in the subject string
    options         option bits
    offsets         points to a vector of ints to be filled in with offsets
    offsetcount     the number of elements in the vector
  
  Returns:          > 0 => success; value is the number of elements filled in
                    = 0 => success, but offsets is not big enough
                     -1 => failed to match
                   < -1 => some kind of unexpected problem
  */
  
  PCRE_EXP_DEFN int
  pcre_exec(const pcre *argument_re, const pcre_extra *extra_data,
    PCRE_SPTR subject, int length, int start_offset, int options, int *offsets,
    int offsetcount)
  {
  int rc, resetcount, ocount;
  int first_byte = -1;
  int req_byte = -1;
  int req_byte2 = -1;
  int newline;
  unsigned long int ims;
  BOOL using_temporary_offsets = FALSE;
  BOOL anchored;
  BOOL startline;
  BOOL firstline;
  BOOL first_byte_caseless = FALSE;
  BOOL req_byte_caseless = FALSE;
  BOOL utf8;
  match_data match_block;
  match_data *md = &match_block;
  const uschar *tables;
  const uschar *start_bits = NULL;
  USPTR start_match = (USPTR)subject + start_offset;
  USPTR end_subject;
  USPTR req_byte_ptr = start_match - 1;
  
  pcre_study_data internal_study;
  const pcre_study_data *study;
  
  real_pcre internal_re;
  const real_pcre *external_re = (const real_pcre *)argument_re;
  const real_pcre *re = external_re;
  
  /* Plausibility checks */
  
  if ((options & ~PUBLIC_EXEC_OPTIONS) != 0) return PCRE_ERROR_BADOPTION;
  if (re == NULL || subject == NULL ||
     (offsets == NULL && offsetcount > 0)) return PCRE_ERROR_NULL;
  if (offsetcount < 0) return PCRE_ERROR_BADCOUNT;
  
  /* Fish out the optional data from the extra_data structure, first setting
  the default values. */
  
  study = NULL;
  md->match_limit = MATCH_LIMIT;
  md->match_limit_recursion = MATCH_LIMIT_RECURSION;
  md->callout_data = NULL;
  
  /* The table pointer is always in native byte order. */
  
  tables = external_re->tables;
  
  if (extra_data != NULL)
    {
    register unsigned int flags = extra_data->flags;
    if ((flags & PCRE_EXTRA_STUDY_DATA) != 0)
      study = (const pcre_study_data *)extra_data->study_data;
    if ((flags & PCRE_EXTRA_MATCH_LIMIT) != 0)
      md->match_limit = extra_data->match_limit;
    if ((flags & PCRE_EXTRA_MATCH_LIMIT_RECURSION) != 0)
      md->match_limit_recursion = extra_data->match_limit_recursion;
    if ((flags & PCRE_EXTRA_CALLOUT_DATA) != 0)
      md->callout_data = extra_data->callout_data;
    if ((flags & PCRE_EXTRA_TABLES) != 0) tables = extra_data->tables;
    }
  
  /* If the exec call supplied NULL for tables, use the inbuilt ones. This
  is a feature that makes it possible to save compiled regex and re-use them
  in other programs later. */
  
  if (tables == NULL) tables = _pcre_default_tables;
  
  /* Check that the first field in the block is the magic number. If it is not,
  test for a regex that was compiled on a host of opposite endianness. If this is
  the case, flipped values are put in internal_re and internal_study if there was
  study data too. */
  
  if (re->magic_number != MAGIC_NUMBER)
    {
    re = _pcre_try_flipped(re, &internal_re, study, &internal_study);
    if (re == NULL) return PCRE_ERROR_BADMAGIC;
    if (study != NULL) study = &internal_study;
    }
  
  /* Set up other data */
  
  anchored = ((re->options | options) & PCRE_ANCHORED) != 0;
  startline = (re->options & PCRE_STARTLINE) != 0;
  firstline = (re->options & PCRE_FIRSTLINE) != 0;
  
  /* The code starts after the real_pcre block and the capture name table. */
  
  md->start_code = (const uschar *)external_re + re->name_table_offset +
    re->name_count * re->name_entry_size;
  
  md->start_subject = (USPTR)subject;
  md->start_offset = start_offset;
  md->end_subject = md->start_subject + length;
  end_subject = md->end_subject;
  
  md->endonly = (re->options & PCRE_DOLLAR_ENDONLY) != 0;
  utf8 = md->utf8 = (re->options & PCRE_UTF8) != 0;
  
  md->notbol = (options & PCRE_NOTBOL) != 0;
  md->noteol = (options & PCRE_NOTEOL) != 0;
  md->notempty = (options & PCRE_NOTEMPTY) != 0;
  md->partial = (options & PCRE_PARTIAL) != 0;
  md->hitend = FALSE;
  
  md->recursive = NULL;                   /* No recursion at top level */
  
  md->lcc = tables + lcc_offset;
  md->ctypes = tables + ctypes_offset;
  
  /* Handle different types of newline. The three bits give eight cases. If
  nothing is set at run time, whatever was used at compile time applies. */
  
  switch ((((options & PCRE_NEWLINE_BITS) == 0)? re->options : (pcre_uint32)options) &
         PCRE_NEWLINE_BITS)
    {
    case 0: newline = NEWLINE; break;   /* Compile-time default */
    case PCRE_NEWLINE_CR: newline = '\r'; break;
    case PCRE_NEWLINE_LF: newline = '\n'; break;
    case PCRE_NEWLINE_CR+
         PCRE_NEWLINE_LF: newline = ('\r' << 8) | '\n'; break;
    case PCRE_NEWLINE_ANY: newline = -1; break;
    case PCRE_NEWLINE_ANYCRLF: newline = -2; break;
    default: return PCRE_ERROR_BADNEWLINE;
    }
  
  if (newline == -2)
    {
    md->nltype = NLTYPE_ANYCRLF;
    }
  else if (newline < 0)
    {
    md->nltype = NLTYPE_ANY;
    }
  else
    {
    md->nltype = NLTYPE_FIXED;
    if (newline > 255)
      {
      md->nllen = 2;
      md->nl[0] = (newline >> 8) & 255;
      md->nl[1] = newline & 255;
      }
    else
      {
      md->nllen = 1;
      md->nl[0] = newline;
      }
    }
  
  /* Partial matching is supported only for a restricted set of regexes at the
  moment. */
  
  if (md->partial && (re->options & PCRE_NOPARTIAL) != 0)
    return PCRE_ERROR_BADPARTIAL;
  
  /* Check a UTF-8 string if required. Unfortunately there's no way of passing
  back the character offset. */
  
  #ifdef SUPPORT_UTF8
  if (utf8 && (options & PCRE_NO_UTF8_CHECK) == 0)
    {
    if (_pcre_valid_utf8((uschar *)subject, length) >= 0)
      return PCRE_ERROR_BADUTF8;
    if (start_offset > 0 && start_offset < length)
      {
      int tb = ((uschar *)subject)[start_offset];
      if (tb > 127)
        {
        tb &= 0xc0;
        if (tb != 0 && tb != 0xc0) return PCRE_ERROR_BADUTF8_OFFSET;
        }
      }
    }
  #endif
  
  /* The ims options can vary during the matching as a result of the presence
  of (?ims) items in the pattern. They are kept in a local variable so that
  restoring at the exit of a group is easy. */
  
  ims = re->options & (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL);
  
  /* If the expression has got more back references than the offsets supplied can
  hold, we get a temporary chunk of working store to use during the matching.
  Otherwise, we can use the vector supplied, rounding down its size to a multiple
  of 3. */
  
  ocount = offsetcount - (offsetcount % 3);
  
  if (re->top_backref > 0 && re->top_backref >= ocount/3)
    {
    ocount = re->top_backref * 3 + 3;
    md->offset_vector = (int *)(pcre_malloc)(ocount * sizeof(int));
    if (md->offset_vector == NULL) return PCRE_ERROR_NOMEMORY;
    using_temporary_offsets = TRUE;
    DPRINTF(("Got memory to hold back references\n"));
    }
  else md->offset_vector = offsets;
  
  md->offset_end = ocount;
  md->offset_max = (2*ocount)/3;
  md->offset_overflow = FALSE;
  md->capture_last = -1;
  
  if (ES3_Compatible_Behavior)
  	md->end_offset_top = 2;
  
  
  /* Compute the minimum number of offsets that we need to reset each time. Doing
  this makes a huge difference to execution time when there aren't many brackets
  in the pattern. */
  
  resetcount = 2 + re->top_bracket * 2;
  if (resetcount > offsetcount) resetcount = ocount;
  
  /* Reset the working variable associated with each extraction. These should
  never be used unless previously set, but they get saved and restored, and so we
  initialize them to avoid reading uninitialized locations. */
  
  if (md->offset_vector != NULL)
    {
    register int *iptr = md->offset_vector + ocount;
    register int *iend = iptr - resetcount/2 + 1;
    while (--iptr >= iend) *iptr = -1;
    }
  
  /* Set up the first character to match, if available. The first_byte value is
  never set for an anchored regular expression, but the anchoring may be forced
  at run time, so we have to test for anchoring. The first char may be unset for
  an unanchored pattern, of course. If there's no first char and the pattern was
  studied, there may be a bitmap of possible first characters. */
  
  if (!anchored)
    {
    if ((re->options & PCRE_FIRSTSET) != 0)
      {
      first_byte = re->first_byte & 255;
      if ((first_byte_caseless = ((re->first_byte & REQ_CASELESS) != 0)) == TRUE)
        first_byte = md->lcc[first_byte];
      }
    else
      if (!startline && study != NULL &&
        (study->options & PCRE_STUDY_MAPPED) != 0)
          start_bits = study->start_bits;
    }
  
  /* For anchored or unanchored matches, there may be a "last known required
  character" set. */
  
  if ((re->options & PCRE_REQCHSET) != 0)
    {
    req_byte = re->req_byte & 255;
    req_byte_caseless = (re->req_byte & REQ_CASELESS) != 0;
    req_byte2 = (tables + fcc_offset)[req_byte];  /* case flipped */
    }
  
  
  /* ==========================================================================*/
  
  /* Loop for handling unanchored repeated matching attempts; for anchored regexs
  the loop runs just once. */
  
  for(;;)
    {
    USPTR save_end_subject = end_subject;
    USPTR new_start_match;
  
    /* Reset the maximum number of extractions we might see. */
  
    if (md->offset_vector != NULL)
      {
      register int *iptr = md->offset_vector;
      register int *iend = iptr + resetcount;
      while (iptr < iend) *iptr++ = -1;
      }
  
    /* Advance to a unique first char if possible. If firstline is TRUE, the
    start of the match is constrained to the first line of a multiline string.
    That is, the match must be before or at the first newline. Implement this by
    temporarily adjusting end_subject so that we stop scanning at a newline. If
    the match fails at the newline, later code breaks this loop. */
  
    if (firstline)
      {
      USPTR t = start_match;
      while (t < md->end_subject && !IS_NEWLINE(t)) t++;
      end_subject = t;
      }
  
    /* Now test for a unique first byte */
  
    if (first_byte >= 0)
      {
      if (first_byte_caseless)
        while (start_match < end_subject &&
               md->lcc[*start_match] != first_byte)
          start_match++;
      else
        while (start_match < end_subject && *start_match != first_byte)
          start_match++;
      }
  
    /* Or to just after a linebreak for a multiline match if possible */
  
    else if (startline)
      {
      if (start_match > md->start_subject + start_offset)
        {
        while (start_match <= end_subject && !WAS_NEWLINE(start_match))
          start_match++;
  
        /* If we have just passed a CR and the newline option is ANY or ANYCRLF,
        and we are now at a LF, advance the match position by one more character.
        */
  
        if (start_match[-1] == '\r' &&
             (md->nltype == NLTYPE_ANY || md->nltype == NLTYPE_ANYCRLF) &&
             start_match < end_subject &&
             *start_match == '\n')
          start_match++;
        }
      }
  
    /* Or to a non-unique first char after study */
  
    else if (start_bits != NULL)
      {
      while (start_match < end_subject)
        {
        register unsigned int c = *start_match;
        if ((start_bits[c/8] & (1 << (c&7))) == 0) start_match++; else break;
        }
      }
  
    /* Restore fudged end_subject */
  
    end_subject = save_end_subject;
  
  #ifdef PCRE_DEBUG  /* Sigh. Some compilers never learn. */
    printf(">>>> Match against: ");
    pchars(start_match, end_subject - start_match, TRUE, md);
    printf("\n");
  #endif
  
    /* If req_byte is set, we know that that character must appear in the subject
    for the match to succeed. If the first character is set, req_byte must be
    later in the subject; otherwise the test starts at the match point. This
    optimization can save a huge amount of backtracking in patterns with nested
    unlimited repeats that aren't going to match. Writing separate code for
    cased/caseless versions makes it go faster, as does using an autoincrement
    and backing off on a match.
  
    HOWEVER: when the subject string is very, very long, searching to its end can
    take a long time, and give bad performance on quite ordinary patterns. This
    showed up when somebody was matching something like /^\d+C/ on a 32-megabyte
    string... so we don't do this when the string is sufficiently long.
  
    ALSO: this processing is disabled when partial matching is requested.
    */
  
    if (req_byte >= 0 &&
        end_subject - start_match < REQ_BYTE_MAX &&
        !md->partial)
      {
      register USPTR p = start_match + ((first_byte >= 0)? 1 : 0);
  
      /* We don't need to repeat the search if we haven't yet reached the
      place we found it at last time. */
  
      if (p > req_byte_ptr)
        {
        if (req_byte_caseless)
          {
          while (p < end_subject)
            {
            register int pp = *p++;
            if (pp == req_byte || pp == req_byte2) { p--; break; }
            }
          }
        else
          {
          while (p < end_subject)
            {
            if (*p++ == req_byte) { p--; break; }
            }
          }
  
        /* If we can't find the required character, break the matching loop,
        forcing a match failure. */
  
        if (p >= end_subject)
          {
          rc = MATCH_NOMATCH;
          break;
          }
  
        /* If we have found the required character, save the point where we
        found it, so that we don't search again next time round the loop if
        the start hasn't passed this character yet. */
  
        req_byte_ptr = p;
        }
      }
  
    /* OK, we can now run the match. */
  
    md->start_match_ptr = start_match;
    md->match_call_count = 0;
    rc = match(start_match, md->start_code, start_match, 2, md, ims, NULL, 0, 0);
  
    switch(rc)
      {
      /* NOMATCH and PRUNE advance by one character. THEN at this level acts
      exactly like PRUNE. */
  
      case MATCH_NOMATCH:
      case MATCH_PRUNE:
      case MATCH_THEN:
      new_start_match = start_match + 1;
  #ifdef SUPPORT_UTF8
      if (utf8)
        while(new_start_match < end_subject && (*new_start_match & 0xc0) == 0x80)
          new_start_match++;
  #endif
      break;
  
      /* SKIP passes back the next starting point explicitly. */
  
      case MATCH_SKIP:
      new_start_match = md->start_match_ptr;
      break;
  
      /* COMMIT disables the bumpalong, but otherwise behaves as NOMATCH. */
  
      case MATCH_COMMIT:
      rc = MATCH_NOMATCH;
      goto ENDLOOP;
  
      /* Any other return is some kind of error. */
  
      default:
      goto ENDLOOP;
      }
  
    /* Control reaches here for the various types of "no match at this point"
    result. Reset the code to MATCH_NOMATCH for subsequent checking. */
  
    rc = MATCH_NOMATCH;
  
    /* If PCRE_FIRSTLINE is set, the match must happen before or at the first
    newline in the subject (though it may continue over the newline). Therefore,
    if we have just failed to match, starting at a newline, do not continue. */
  
    if (firstline && IS_NEWLINE(start_match)) break;
  
    /* Advance to new matching position */
  
    start_match = new_start_match;
  
    /* Break the loop if the pattern is anchored or if we have passed the end of
    the subject. */
  
    if (anchored || start_match > end_subject) break;
  
    /* If we have just passed a CR and we are now at a LF, and the pattern does
    not contain any explicit matches for \r or \n, and the newline option is CRLF
    or ANY or ANYCRLF, advance the match position by one more character. */
  
    if (start_match[-1] == '\r' &&
        start_match < end_subject &&
        *start_match == '\n' &&
        (re->options & PCRE_HASCRORLF) == 0 &&
          (md->nltype == NLTYPE_ANY ||
           md->nltype == NLTYPE_ANYCRLF ||
           md->nllen == 2))
      start_match++;
  
    }   /* End of for(;;) "bumpalong" loop */
  
  /* ==========================================================================*/
  
  /* We reach here when rc is not MATCH_NOMATCH, or if one of the stopping
  conditions is true:
  
  (1) The pattern is anchored or the match was failed by (*COMMIT);
  
  (2) We are past the end of the subject;
  
  (3) PCRE_FIRSTLINE is set and we have failed to match at a newline, because
      this option requests that a match occur at or before the first newline in
      the subject.
  
  When we have a match and the offset vector is big enough to deal with any
  backreferences, captured substring offsets will already be set up. In the case
  where we had to get some local store to hold offsets for backreference
  processing, copy those that we can. In this case there need not be overflow if
  certain parts of the pattern were not used, even though there are more
  capturing parentheses than vector slots. */
  
  ENDLOOP:
  
  if (rc == MATCH_MATCH)
    {
    if (using_temporary_offsets)
      {
      if (offsetcount >= 4)
        {
        VMPI_memcpy(offsets + 2, md->offset_vector + 2,
          (offsetcount - 2) * sizeof(int));
        DPRINTF(("Copied offsets from temporary memory\n"));
        }
      if (md->end_offset_top > offsetcount) md->offset_overflow = TRUE;
      DPRINTF(("Freeing temporary memory\n"));
      (pcre_free)(md->offset_vector);
      }
  
    /* Set the return code to the number of captured strings, or 0 if there are
    too many to fit into the vector. */
  
  	// ECMAScript compatible behavior means always returning as many elements as there were groups (+1).  PERL behavior is to return only as many results as the number of groups actually visited (+1)
  	rc = md->offset_overflow? 0 : (ES3_Compatible_Behavior ? resetcount/2 : md->end_offset_top/2);
  
  //  rc = md->offset_overflow? 0 : md->end_offset_top/2;
  
    /* If there is space, set up the whole thing as substring 0. The value of
    md->start_match_ptr might be modified if \K was encountered on the success
    matching path. */
  
    if (offsetcount < 2) rc = 0; else
      {
      offsets[0] = md->start_match_ptr - md->start_subject;
      offsets[1] = md->end_match_ptr - md->start_subject;
      }
  
    DPRINTF((">>>> returning %d\n", rc));
    return rc;
    }
  
  /* Control gets here if there has been an error, or if the overall match
  attempt has failed at all permitted starting positions. */
  
  if (using_temporary_offsets)
    {
    DPRINTF(("Freeing temporary memory\n"));
    (pcre_free)(md->offset_vector);
    }
  
  if (rc != MATCH_NOMATCH)
    {
    DPRINTF((">>>> error: returning %d\n", rc));
    return rc;
    }
  else if (md->partial && md->hitend)
    {
    DPRINTF((">>>> returning PCRE_ERROR_PARTIAL\n"));
    return PCRE_ERROR_PARTIAL;
    }
  else
    {
    DPRINTF((">>>> returning PCRE_ERROR_NOMATCH\n"));
    return PCRE_ERROR_NOMATCH;
    }
  }
  
  /* End of pcre_exec.c */
  