private void removeHighlights(HighlightManager highlightManager) {
    final Editor sampleEditor = mySampleText.getEditor();
    if (sampleEditor != null) {
      for (RangeHighlighter highlighter : mySampleHighlights) {
        highlightManager.removeSegmentHighlighter(sampleEditor, highlighter);
      }
      mySampleHighlights.clear();
    }
    final Editor regExpEditor = myRegExp.getEditor();
    if (myRegExpHighlight != null && regExpEditor != null) {
      highlightManager.removeSegmentHighlighter(regExpEditor, myRegExpHighlight);
      myRegExpHighlight = null;
    }
  }
private void removeHighlights(HighlightManager highlightManager)