public static String replaceUnicodeEscapeSequences(String text) {
    if (text == null) return null;

    Matcher matcher = UNICODE_CHAR.matcher(text);
    if (!matcher.find()) return text; // fast path

    matcher.reset();
    int lastEnd = 0;
    StringBuilder sb = new StringBuilder(text.length());
    while (matcher.find()) {
      sb.append(text, lastEnd, matcher.start());
      char c = (char)Integer.parseInt(matcher.group().substring(2), 16);
      sb.append(c);
      lastEnd = matcher.end();
    }
    sb.append(text.substring(lastEnd));
    return sb.toString();
  }
public static String replaceUnicodeEscapeSequences(String text)