Bsd regex functions
char *re_comp(const char *regex);
int re_exec(const 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.
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.
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