OP_WORD_BEGIN    1420 ext/mbstring/oniguruma/regcomp.c   case ANCHOR_WORD_BEGIN:     r = add_opcode(reg, OP_WORD_BEGIN);     break;
OP_WORD_BEGIN    5708 ext/mbstring/oniguruma/regcomp.c   { OP_WORD_BEGIN,          "word-begin",      ARG_NON },
OP_WORD_BEGIN    1962 ext/mbstring/oniguruma/regexec.c     case OP_WORD_BEGIN:  MOP_IN(OP_WORD_BEGIN);