usr.bin/elvis/regexp.h

/*
 * Definitions etc. for regexp(3) routines.
 *
 * Caveat:  this is V8 regexp(3) [actually, a reimplementation thereof],
 * not the System V one.
 */
#define NSUBEXP  10

typedef struct regexp {
        char    *startp[NSUBEXP];
        char    *endp[NSUBEXP];
        int     minlen;         /* length of shortest possible match */
        char    first;          /* first character, if known; else \0 */
        char    bol;            /* boolean: must start at beginning of line? */
        char    program[1];     /* Unwarranted chumminess with compiler. */
} regexp;

extern regexp *regcomp();
extern int regexec();
extern void regsub();
extern void regerr();