gistfile1.java

CharsetEncoder encLatin = Charset.forName("ISO-8859-1").newEncoder();

if (encLatin.canEncode(msg)) {
  return Normalizer.
      normalize(msg, Normalizer.Form.NFD).
      replaceAll("[^\\p{ASCII}\\x0a\\x0d\\x20-\\x7a\\xa1\\xa3\\xa4\\xa5\\xa7\\xbf\\xc4\\xc5\\xc6\\xc7\\xc9\\xd1\\xd6\\xd8\\xdc\\xdf\\xe0\\xe4\\xe5\\xe6\\xe8\\xe9\\xec\\xf1\\xf2\\xf6\\xf8\\xf9\\xfc]", "");

} else {
  return new String(Hex.encodeHex(msg.getBytes("UTF-16")));
}