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char *re_comp(char *regex);
int re_exec(char *string);
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.
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.
Multithreading (see pthreads(7))
The re_comp() and re_exec() functions are not thread-safe.
These functions are obsolete; the functions documented in regcomp(3)
should be used instead.
regcomp(3), regex(7), GNU regex manual
GNU 2013-06-21 RE_COMP(3)