OP_LOOK_BEHIND   1445 ext/mbstring/oniguruma/regcomp.c       r = add_opcode(reg, OP_LOOK_BEHIND);
OP_LOOK_BEHIND   5752 ext/mbstring/oniguruma/regcomp.c   { OP_LOOK_BEHIND,          "look-behind",          ARG_SPECIAL },
OP_LOOK_BEHIND   6028 ext/mbstring/oniguruma/regcomp.c     case OP_LOOK_BEHIND:
OP_LOOK_BEHIND   2639 ext/mbstring/oniguruma/regexec.c     case OP_LOOK_BEHIND:  MOP_IN(OP_LOOK_BEHIND);