text: #ifndef _REGEX_H_
  #define _REGEX_H_				/* never again */
  /*
   * regular expressions
   *
   * Copyright (c) 1998, 1999 Henry Spencer.	All rights reserved.
   *
   * Development of this software was funded, in part, by Cray Research Inc.,
   * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
   * Corporation, none of whom are responsible for the results.  The author
   * thanks all of them.
   *
   * Redistribution and use in source and binary forms -- with or without
   * modification -- are permitted for any purpose, provided that
   * redistributions in source form retain this entire copyright notice and
   * indicate the origin and nature of any modifications.
   *
   * I'd appreciate being given credit for this package in the documentation
   * of software which uses it, but that is not a requirement.
   *
   * THIS SOFTWARE IS PROVIDED ``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
   * HENRY SPENCER 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.
   *
   * $PostgreSQL: pgsql/src/include/regex/regex.h,v 1.32 2009/10/21 20:38:58 tgl Exp $
   */
  
  /*
   * Add your own defines, if needed, here.
   */
  #include "mb/pg_wchar.h"
  
  /*
   * interface types etc.
   */
  
  /*
   * regoff_t has to be large enough to hold either off_t or ssize_t,
   * and must be signed; it's only a guess that long is suitable.
   */
  typedef long regoff_t;
  
  /*
   * other interface types
   */
  
  /* the biggie, a compiled RE (or rather, a front end to same) */
  typedef struct
  {
  	int			re_magic;		/* magic number */
  	size_t		re_nsub;		/* number of subexpressions */
  	long		re_info;		/* information about RE */
  #define  REG_UBACKREF		 000001
  #define  REG_ULOOKAHEAD		 000002
  #define  REG_UBOUNDS	 000004
  #define  REG_UBRACES	 000010
  #define  REG_UBSALNUM		 000020
  #define  REG_UPBOTCH	 000040
  #define  REG_UBBS		 000100
  #define  REG_UNONPOSIX		 000200
  #define  REG_UUNSPEC	 000400
  #define  REG_UUNPORT	 001000
  #define  REG_ULOCALE	 002000
  #define  REG_UEMPTYMATCH	 004000
  #define  REG_UIMPOSSIBLE	 010000
  #define  REG_USHORTEST		 020000
  	int			re_csize;		/* sizeof(character) */
  	char	   *re_endp;		/* backward compatibility kludge */
  	/* the rest is opaque pointers to hidden innards */
  	char	   *re_guts;		/* `char *' is more portable than `void *' */
  	char	   *re_fns;
  } regex_t;
  
  /* result reporting (may acquire more fields later) */
  typedef struct
  {
  	regoff_t	rm_so;			/* start of substring */
  	regoff_t	rm_eo;			/* end of substring */
  } regmatch_t;
  
  /* supplementary control and reporting */
  typedef struct
  {
  	regmatch_t	rm_extend;		/* see REG_EXPECT */
  } rm_detail_t;
  
  
  
  /*
   * regex compilation flags
   */
  #define REG_BASIC	000000		/* BREs (convenience) */
  #define REG_EXTENDED	000001	/* EREs */
  #define REG_ADVF	000002		/* advanced features in EREs */
  #define REG_ADVANCED	000003	/* AREs (which are also EREs) */
  #define REG_QUOTE	000004		/* no special characters, none */
  #define REG_NOSPEC	REG_QUOTE	/* historical synonym */
  #define REG_ICASE	000010		/* ignore case */
  #define REG_NOSUB	000020		/* don't care about subexpressions */
  #define REG_EXPANDED	000040	/* expanded format, white space & comments */
  #define REG_NLSTOP	000100		/* \n doesn't match . or [^ ] */
  #define REG_NLANCH	000200		/* ^ matches after \n, $ before */
  #define REG_NEWLINE 000300		/* newlines are line terminators */
  #define REG_PEND	000400		/* ugh -- backward-compatibility hack */
  #define REG_EXPECT	001000		/* report details on partial/limited matches */
  #define REG_BOSONLY 002000		/* temporary kludge for BOS-only matches */
  #define REG_DUMP	004000		/* none of your business :-) */
  #define REG_FAKE	010000		/* none of your business :-) */
  #define REG_PROGRESS	020000	/* none of your business :-) */
  
  
  
  /*
   * regex execution flags
   */
  #define REG_NOTBOL	0001		/* BOS is not BOL */
  #define REG_NOTEOL	0002		/* EOS is not EOL */
  #define REG_STARTEND	0004	/* backward compatibility kludge */
  #define REG_FTRACE	0010		/* none of your business */
  #define REG_MTRACE	0020		/* none of your business */
  #define REG_SMALL	0040		/* none of your business */
  
  
  /*
   * error reporting
   * Be careful if modifying the list of error codes -- the table used by
   * regerror() is generated automatically from this file!
   */
  #define REG_OKAY	 0			/* no errors detected */
  #define REG_NOMATCH  1			/* failed to match */
  #define REG_BADPAT	 2			/* invalid regexp */
  #define REG_ECOLLATE	 3		/* invalid collating element */
  #define REG_ECTYPE	 4			/* invalid character class */
  #define REG_EESCAPE  5			/* invalid escape \ sequence */
  #define REG_ESUBREG  6			/* invalid backreference number */
  #define REG_EBRACK	 7			/* brackets [] not balanced */
  #define REG_EPAREN	 8			/* parentheses () not balanced */
  #define REG_EBRACE	 9			/* braces {} not balanced */
  #define REG_BADBR	10			/* invalid repetition count(s) */
  #define REG_ERANGE	11			/* invalid character range */
  #define REG_ESPACE	12			/* out of memory */
  #define REG_BADRPT	13			/* quantifier operand invalid */
  #define REG_ASSERT	15			/* "can't happen" -- you found a bug */
  #define REG_INVARG	16			/* invalid argument to regex function */
  #define REG_MIXED	17			/* character widths of regex and string differ */
  #define REG_BADOPT	18			/* invalid embedded option */
  #define REG_ETOOBIG 19			/* nfa has too many states */
  /* two specials for debugging and testing */
  #define REG_ATOI	101			/* convert error-code name to number */
  #define REG_ITOA	102			/* convert error-code number to name */
  /* non-error result codes for pg_regprefix */
  #define REG_PREFIX	(-1)		/* identified a common prefix */
  #define REG_EXACT	(-2)		/* identified an exact match */
  
  
  
  /*
   * the prototypes for exported functions
   */
  extern int	pg_regcomp(regex_t *, const pg_wchar *, size_t, int);
  extern int	pg_regexec(regex_t *, const pg_wchar *, size_t, size_t, rm_detail_t *, size_t, regmatch_t[], int);
  extern int	pg_regprefix(regex_t *, pg_wchar **, size_t *);
  extern void pg_regfree(regex_t *);
  extern size_t pg_regerror(int, const regex_t *, char *, size_t);
  
  #endif   /* _REGEX_H_ */
  