ONIGERR_EMPTY_CHAR_CLASS 77 ext/mbstring/oniguruma/regerror.c case ONIGERR_EMPTY_CHAR_CLASS: ONIGERR_EMPTY_CHAR_CLASS 4204 ext/mbstring/oniguruma/regparse.c return ONIGERR_EMPTY_CHAR_CLASS; ONIGERR_EMPTY_CHAR_CLASS 73 ext/mbstring/oniguruma/regposix.c { ONIGERR_EMPTY_CHAR_CLASS, REG_ECTYPE },