ONOFF            4659 regparse.c     	  case 'x':  ONOFF(option, ONIG_OPTION_EXTEND,     neg); break;
ONOFF            4660 regparse.c     	  case 'i':  ONOFF(option, ONIG_OPTION_IGNORECASE, neg); break;
ONOFF            4663 regparse.c     	      ONOFF(option, ONIG_OPTION_MULTILINE,  neg);
ONOFF            4671 regparse.c     	      ONOFF(option, ONIG_OPTION_SINGLELINE, (neg == 0 ? 1 : 0));
ONOFF            4674 regparse.c     	      ONOFF(option, ONIG_OPTION_MULTILINE,  neg);
ONOFF            4681 regparse.c     	    ONOFF(option, ONIG_OPTION_MULTILINE|ONIG_OPTION_SINGLELINE, neg);