OP_WORD_BOUND    1397 mbstring/oniguruma/regcomp.c   case ANCHOR_WORD_BOUND:     r = add_opcode(reg, OP_WORD_BOUND);     break;
OP_WORD_BOUND    5501 mbstring/oniguruma/regcomp.c   { OP_WORD_BOUND,          "word-bound",      ARG_NON },
OP_WORD_BOUND    2108 mbstring/oniguruma/regexec.c     case OP_WORD_BOUND:  STAT_OP_IN(OP_WORD_BOUND);