docs: public String categoryAndFunction(String category) {
      if (category == null) {
        return null;
      }
      String catFunc = category;
      int i = lastIndexOfNumericTag(catFunc);
      while (i >= 0) {
        catFunc = catFunc.substring(0, i);
        i = lastIndexOfNumericTag(catFunc);
      }
      return catFunc;
    }