OP_WORD_BOUND    1417 ext/mbstring/oniguruma/regcomp.c   case ANCHOR_WORD_BOUND:     r = add_opcode(reg, OP_WORD_BOUND);     break;
OP_WORD_BOUND    5706 ext/mbstring/oniguruma/regcomp.c   { OP_WORD_BOUND,          "word-bound",      ARG_NON },
OP_WORD_BOUND    1924 ext/mbstring/oniguruma/regexec.c     case OP_WORD_BOUND:  MOP_IN(OP_WORD_BOUND);