@Override
  public void visitSimpleClass(RegExpSimpleClass simpleClass) {
    if (!myLanguageHosts.supportsSimpleClass(simpleClass)) {
      myHolder.newAnnotation(HighlightSeverity.ERROR, RegExpBundle.message("error.illegal.unsupported.escape.sequence")).create();
    }
  }
@Override
  public void visitSimpleClass(RegExpSimpleClass simpleClass)