OP_WORD_END      1401 mbstring/oniguruma/regcomp.c   case ANCHOR_WORD_END:       r = add_opcode(reg, OP_WORD_END);       break;
OP_WORD_END      5504 mbstring/oniguruma/regcomp.c   { OP_WORD_END,            "word-end",        ARG_NON },
OP_WORD_END      2156 mbstring/oniguruma/regexec.c     case OP_WORD_END:  STAT_OP_IN(OP_WORD_END);