code: private boolean checkIdentical(int start, int end) {
          if (strength_ != Collator.IDENTICAL) {
              return true;
          }
          // Note: We could use Normalizer::compare() or similar, but for short strings
          // which may not be in FCD it might be faster to just NFD them.
          String textstr = getString(targetText, start, end - start);
          if (Normalizer.quickCheck(textstr, Normalizer.NFD, 0) == Normalizer.NO) {
              textstr = Normalizer.decompose(textstr, false);
          }
          String patternstr = pattern_.text_;
          if (Normalizer.quickCheck(patternstr, Normalizer.NFD, 0) == Normalizer.NO) {
              patternstr = Normalizer.decompose(patternstr, false);
          }
          return textstr.equals(patternstr);
      }
docs: Checks for identical match
  @param start offset of possible match
  @param end offset of possible match
  @return TRUE if identical match is found