private boolean isLabelIncluded( final String sampleLabel ) {
    // check if label is included
    boolean included = true;
    if( includedRegEx != null && ! includedRegEx.isEmpty() ) {
      included = false;
      for( Pattern regEx : includedRegEx ) {
        if( regEx.matcher( sampleLabel ).matches() ) {
          included = true;
          break;
        }
      }
    }

    if( included && excludedRegEx != null && ! excludedRegEx.isEmpty() ) {
      for( Pattern regEx : excludedRegEx ) {
        if( regEx.matcher( sampleLabel ).matches() ) {
          included = false;
          break;
        }
      }
    }
    return included;
  }