@Nullable
  public String getMemberPattern() {
    final String enteredText = getTrimmedText();
    final int index = enteredText.lastIndexOf('#');
    if (index == -1) {
      return null;
    }

    String name = enteredText.substring(index + 1).trim();
    return StringUtil.isEmpty(name) ? null : name;
  }
@Nullable
  public String getMemberPattern()