Don't try and trim null strings.

     * Non-breaking whitespaces are also removed.

     */

    public static String trim(CharSequence s) {

        if (s == null) {

            return null;

        }

        // Just strip any sequence of whitespace or java space characters from the beginning and end

        Matcher m = sTrimPattern.matcher(s);

        return m.replaceAll("$1");