preg_last_error Returns the error code of the last PCRE regex execution &reftitle.description; intpreg_last_error Returns the error code of the last PCRE regex execution. &reftitle.returnvalues; Returns one of the following constants (explained on their own page): PREG_NO_ERROR PREG_INTERNAL_ERROR PREG_BACKTRACK_LIMIT_ERROR (see also pcre.backtrack_limit) PREG_RECURSION_LIMIT_ERROR (see also pcre.recursion_limit) PREG_BAD_UTF8_ERROR