text: define(['common'], function(common) {
  
    function trim(str, characters) {
      if (str == null) return '';
      if (!characters && String.prototype.trim) return String.prototype.trim.call(str);
      characters = common.defaultToWhiteSpace(characters);
      return String(str).replace(new RegExp('\^' + characters + '+|' + characters + '+$', 'g'), '');
    }
  
    return trim;
  
  });
  