text: #ifndef _REGEX_H
  #include "grep-2.5.posix.regex.h"
  
  /* Document internal interfaces.  */
  extern reg_syntax_t __re_set_syntax _RE_ARGS ((reg_syntax_t syntax));
  
  extern const char *__re_compile_pattern
    _RE_ARGS ((const char *pattern, size_t length,
               struct re_pattern_buffer *buffer));
  
  extern int __re_compile_fastmap _RE_ARGS ((struct re_pattern_buffer *buffer));
  
  extern int __re_search
    _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string,
              int length, int start, int range, struct re_registers *regs));
  
  extern int __re_search_2
    _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1,
               int length1, const char *string2, int length2,
               int start, int range, struct re_registers *regs, int stop));
  
  extern int __re_match
    _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string,
               int length, int start, struct re_registers *regs));
  
  extern int __re_match_2
    _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1,
               int length1, const char *string2, int length2,
               int start, struct re_registers *regs, int stop));
  
  extern void __re_set_registers
    _RE_ARGS ((struct re_pattern_buffer *buffer, struct re_registers *regs,
               unsigned num_regs, regoff_t *starts, regoff_t *ends));
  
  extern int __regcomp _RE_ARGS ((regex_t *__preg, const char *__pattern,
  				int __cflags));
  
  extern int __regexec _RE_ARGS ((const regex_t *__preg,
  				const char *__string, size_t __nmatch,
  				regmatch_t __pmatch[], int __eflags));
  
  extern size_t __regerror _RE_ARGS ((int __errcode, const regex_t *__preg,
  				    char *__errbuf, size_t __errbuf_size));
  
  extern void __regfree _RE_ARGS ((regex_t *__preg));
  #endif
  