Let's try ng-repeat-start & ng-repeat-end.
<div class="example-animate-container">
<div class="square" ng-repeat-start="friend in a">
{{$index}}
</div>
<div ng-if="$index % 3 == 2" ng-repeat-end>
extra div
</div>
</div>
Please note that ng-repeat-start directive is included since angular 1.2.1.
plnkr demo
ng-repeat: repeat a series of elements of "one" parent element
<!--====repeater range=====-->
<Any ng-repeat="friend in friends">
</Any>
<!--====end of repeater range=====-->
ng-repeat-start & ng-repeat-end: using ng-repeat-start and ng-repeat-end to define the start point and end point of extended repeater range
<!--====repeater range start from here=====-->
<Any ng-repeat="friend in friends" ng-repeat-start>
{{friend.name}}
</Any><!-- ng-repeat element is not the end point of repeating range anymore-->
<!--Still in the repeater range-->
<h1>{{friend.name}}</h1>
<!--HTML tag with "ng-repeat-end" directive define the end point of range -->
<footer ng-repeat-end>
</footer>
<!--====end of repeater range=====-->