@Override
  public RegExpAtom getCondition() {
    final PsiElement sibling = getFirstChild().getNextSibling();
    if (!(sibling instanceof RegExpBackref) && !(sibling instanceof RegExpNamedGroupRef) && !(sibling instanceof RegExpGroup)) {
      return null;
    }
    return (RegExpAtom)sibling;
  }
@Override
  public RegExpAtom getCondition()