ANCHOR_WORD_BOUND 1399 ext/mbstring/oniguruma/regcomp.c   case ANCHOR_WORD_BOUND:     r = add_opcode(reg, OP_WORD_BOUND);     break;
ANCHOR_WORD_BOUND 5932 ext/mbstring/oniguruma/regcomp.c     case ANCHOR_WORD_BOUND:      fputs("word bound",     f); break;
ANCHOR_WORD_BOUND 3080 ext/mbstring/oniguruma/regparse.c       tok->u.anchor = ANCHOR_WORD_BOUND;