code: function(attrs) {
        var options = {};
        for(var key in attrs) {
          if (key.match(/^\$/) || key.match(/^ng[A-Z]/)) {
            void(0);
          } else {
            options[key] = attrs[key];
          }
        }
        return options;
      }
docs: filters attributes by skipping angularjs methods $.. $$..
  @memberof Attr2MapOptions
  @param {Hash} attrs tag attributes
  @returns {Hash} filterd attributes