OP_WORD_BEGIN    1400 mbstring/oniguruma/regcomp.c   case ANCHOR_WORD_BEGIN:     r = add_opcode(reg, OP_WORD_BEGIN);     break;
OP_WORD_BEGIN    5503 mbstring/oniguruma/regcomp.c   { OP_WORD_BEGIN,          "word-begin",      ARG_NON },
OP_WORD_BEGIN    2146 mbstring/oniguruma/regexec.c     case OP_WORD_BEGIN:  STAT_OP_IN(OP_WORD_BEGIN);