musl/include/regex.h

#ifndef _REGEX_H
#define _REGEX_H

#ifdef __cplusplus
extern "C" {
#endif

#if __STDC_VERSION__ >= 199901L
#define __restrict restrict
#elif !defined(__GNUC__)
#define __restrict
#endif

#define __NEED_size_t

#include <bits/alltypes.h>

typedef long regoff_t;

typedef struct {
	size_t re_nsub;
	void *__opaque, *__padding[4];
	size_t __nsub2;
} regex_t;

typedef struct {
	regoff_t rm_so;
	regoff_t rm_eo;
} regmatch_t;

#define REG_EXTENDED    1
#define REG_ICASE       2
#define REG_NEWLINE     4
#define REG_NOSUB       8

#define REG_NOTBOL      1
#define REG_NOTEOL      2

#define REG_OK          0
#define REG_NOMATCH     1
#define REG_BADPAT      2
#define REG_ECOLLATE    3
#define REG_ECTYPE      4
#define REG_EESCAPE     5
#define REG_ESUBREG     6
#define REG_EBRACK      7
#define REG_EPAREN      8
#define REG_EBRACE      9
#define REG_BADBR       10
#define REG_ERANGE      11
#define REG_ESPACE      12
#define REG_BADRPT      13

#define REG_ENOSYS      -1

int regcomp(regex_t *__restrict, const char *__restrict, int);
int regexec(const regex_t *__restrict, const char *__restrict, size_t, regmatch_t *__restrict, int);
void regfree(regex_t *);

size_t regerror(int, const regex_t *__restrict, char *__restrict, size_t);

#ifdef __cplusplus
}
#endif

#endif