angularjs - md-autocomplete+md-chip で検証を行う方法

Question

次のようにオートコンプリートで検証を行う必要があります

• 最小の長さ
• 最大長
• チップの総数

私のHTMLがこれらすべての検証を検証する正しい方法を見つけることができません

<md-chips md-on-add="selectedGroups.add($chip)" ng-focus="userTag"
                    ng-model="selectedGroups" is="tagSelect" md-autocomplete-snap
                    md-require-match="true" md-max-chips="3" maxlength="10">
                <md-autocomplete 
                    md-search-text="searchText"
                    md-items="item in queryGroups(searchText)" 
                    md-item-text="item"
                    md-autoselect="true" md-select-on-match="true"
                    md-no-cache="true"
                    md-require-match="true"
                    md-input-name="autocompleteField"
                    md-input-minlength="2"
                    md-input-maxlength="5"
                    >
                     <span
                    md-highlight-text="searchText">{{item}}</span>
                    <div ng-messages="searchForm.autocompleteField.$error" ng-if="searchForm.autocompleteField.$touched">
                <div  ng-message="required">You <b>must</b> have a favorite state.</div>
                <div  ng-message="minlength">Your entry is not long enough.</div>
                <div  ng-message="maxlength">Your entry is too long.</div>
              </div>
                     </md-autocomplete> 
                    <md-chip-template
                    ng-maxlength="2" md-max-chips="5" required> <span>{{$chip}}</span>
                </md-chip-template> </md-chips>

私のjsは

   var allGroups = ['one','two','three'  ];
$scope.queryGroups = function(search) {

    var firstPass = $filter('filter')($scope.allGroups, search);
       return firstPass.filter(function(item) {
        return $scope.selectedGroups.indexOf(item) === -1;
        console.log(item)
    });

};

私を助けてください