glibc/include/regex.h

#ifndef _REGEX_H
#include <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