re_comp(3) — Linux manual page


re_comp(3)              Library Functions Manual              re_comp(3)

NAME         top

       re_comp, re_exec - BSD regex functions

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #define _REGEX_RE_COMP
       #include <sys/types.h>
       #include <regex.h>

       [[deprecated]] char *re_comp(const char *regex);
       [[deprecated]] int re_exec(const char *string);

DESCRIPTION         top

       re_comp() is used to compile the null-terminated regular
       expression pointed to by regex.  The compiled pattern occupies a
       static area, the pattern buffer, which is overwritten by
       subsequent use of re_comp().  If regex is NULL, no operation is
       performed and the pattern buffer's contents are not altered.

       re_exec() is used to assess whether the null-terminated string
       pointed to by string matches the previously compiled regex.

RETURN VALUE         top

       re_comp() returns NULL on successful compilation of regex
       otherwise it returns a pointer to an appropriate error message.

       re_exec() returns 1 for a successful match, zero for failure.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       │ Interface                         Attribute     Value     │
       │ re_comp(), re_exec()              │ Thread safety │ MT-Unsafe │

STANDARDS         top


HISTORY         top


       These functions are obsolete; the functions documented in
       regcomp(3) should be used instead.

SEE ALSO         top

       regcomp(3), regex(7), GNU regex manual

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                     re_comp(3)