allow_reverse    4896 ext/mbstring/oniguruma/regcomp.c     int allow_reverse;
allow_reverse    4902 ext/mbstring/oniguruma/regcomp.c     allow_reverse =
allow_reverse    4905 ext/mbstring/oniguruma/regcomp.c     if (e->len >= 3 || (e->len >= 2 && allow_reverse)) {
allow_reverse    4910 ext/mbstring/oniguruma/regcomp.c       reg->optimize = (allow_reverse != 0