OP_EXACT4         345 regcomp.c            case 4:  op = OP_EXACT4; break;
OP_EXACT4        6156 regcomp.c        { OP_EXACT4,            "exact4",          ARG_SPECIAL },
OP_EXACT4        6362 regcomp.c          case OP_EXACT4:
OP_EXACT4        1809 regexec.c          CASE(OP_EXACT4)  MOP_IN(OP_EXACT4);