@Override
  public PsiReference getReference() {
    if (getNode().findChildByType(RegExpTT.NAME) == null) {
      return null;
    }
    return new PsiReference() {
      @NotNull
      @Override
      public PsiElement getElement() {
        return RegExpNamedGroupRefImpl.this;
      }

      @NotNull
      @Override
      public TextRange getRangeInElement() {
        final ASTNode nameNode = getNode().findChildByType(RegExpTT.NAME);
        assert nameNode != null;
        final int startOffset = getNode().getFirstChildNode().getTextLength();
        return new TextRange(startOffset, startOffset + nameNode.getTextLength());
      }

      @Override
      public PsiElement resolve() {
        return RegExpNamedGroupRefImpl.this.resolve();
      }

      @Override
      @NotNull
      public String getCanonicalText() {
        return getRangeInElement().substring(getText());
      }

      @Override
      public PsiElement handleElementRename(@NotNull String newElementName) throws IncorrectOperationException {
        throw new UnsupportedOperationException();
      }

      @Override
      public PsiElement bindToElement(@NotNull PsiElement element) throws IncorrectOperationException {
        throw new UnsupportedOperationException();
      }

      @Override
      public boolean isReferenceTo(@NotNull PsiElement element) {
        return resolve() == element;
      }

      @Override
      public Object @NotNull [] getVariants() {
        return SyntaxTraverser.psiTraverser(getContainingFile()).filter(RegExpGroup.class)
          .filter(RegExpGroup::isAnyNamedGroup).toArray(new RegExpGroup[0]);
      }

      @Override
      public boolean isSoft() {
        return false;
      }
    };
  }
@Override
  public PsiReference getReference()