OP_POP           1329 mbstring/oniguruma/regcomp.c       r = add_opcode(reg, OP_POP);
OP_POP           5529 mbstring/oniguruma/regcomp.c   { OP_POP,                 "pop",                  ARG_NON },
OP_POP           2649 mbstring/oniguruma/regexec.c     case OP_POP:  STAT_OP_IN(OP_POP);