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re_comp(3) — Linux manual page

re_comp(3)               Library Functions Manualre_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 byregex.  The compiled pattern occupies a       static area, the pattern buffer, which is overwritten by       subsequent use ofre_comp().  Ifregex 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 bystring matches the previously compiledregex.

RETURN VALUE        top

re_comp() returns NULL on successful compilation ofregex       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, seeattributes(7).       ┌────────────────────────────────────┬───────────────┬───────────┐       │Interface│Attribute│Value│       ├────────────────────────────────────┼───────────────┼───────────┤       │re_comp(),re_exec()               │ Thread safety │ MT-Unsafe │       └────────────────────────────────────┴───────────────┴───────────┘

STANDARDS        top

       None.

HISTORY        top

       4.3BSD.       These functions are obsolete; the functions documented inregcomp(3) should be used instead.

SEE ALSO        top

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

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17re_comp(3)

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