code: function(elem) {
      var pattern = new RegExp(_filterValue, 'i');
      var element = elem;
      if (pattern.test(element.textContent)) {
        element.style.display = '';
      } else {
        element.style.display = 'none';
      }
    }
docs: Hide element if doesn't contain filter value
  
  @param {Object} element
  @private