@Override
    public void visitRegExpBackref(RegExpBackref backref) {
      final Collection<RegExpGroup.Type> types = RegExpLanguageHosts.getInstance().getSupportedNamedGroupTypes(backref);
      if (types.isEmpty()) {
        return;
      }
      myHolder.registerProblem(backref, RegExpBundle.message("inspection.warning.numeric.back.reference"));
    }
@Override
    public void visitRegExpBackref(RegExpBackref backref)