private static TextRange findNaturalRange(String editorText, int start, int end) {
    while (start > 0) {
      if (!isNatural(editorText.charAt(start - 1))) {
        break;
      }
      start--;
    }

    while (end < editorText.length()) {
      final char c = editorText.charAt(end);
      if (!isNatural(c)) {
        break;
      }
      end++;
    }
    return new TextRange(start, end);
  }
private static TextRange findNaturalRange(String editorText, int start, int end)