php man page for re_comp

RE_COMP(3)						     Linux Programmer's Manual							RE_COMP(3)

NAME
       re_comp, re_exec - BSD regex functions

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

       char *re_comp(const char *regex);

       int re_exec(const char *string);

DESCRIPTION
       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
       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
       For an explanation of the terms used in this section, see attributes(7).

       +---------------------+---------------+-----------+
       |Interface	     | Attribute     | Value	 |
       +---------------------+---------------+-----------+
       |re_comp(), re_exec() | Thread safety | MT-Unsafe |
       +---------------------+---------------+-----------+
CONFORMING TO
       4.3BSD.

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

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

COLOPHON
       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-09-15								RE_COMP(3)