code: public void resetWithEmptyString()
      {
          mInputBuffer = null;
          mInputStart = -1; // indicates shared buffer not used
          mInputLen = 0;
          mResultString = "";
          mResultArray = null;
          if (mHasSegments) {
              clearSegments();
          }
          mCurrentSize = 0;
      }
docs: Similar to {@link #resetWithEmpty}, but actively marks current
  text content to be empty string (whereas former method leaves
  content as undefined).