fix(ngRepeat): allow extra whitespaces in (key,value) of ngRepeat

Whitespaces allowed in (key,value) expression of ngRepeat.

e.g. (  aaa  ,   bbb  ) will be accepted by parser

closes #6827

Author: SekibOmazic

src/ng/directive/ngRepeat.js

@@ -240,7 +240,7 @@ var ngRepeatDirective = ['$parse', '$animate', function($parse, $animate) {
           };
         }
 
-        match = lhs.match(/^(?:([\$\w]+)|\(([\$\w]+)\s*,\s*([\$\w]+)\))$/);
+        match = lhs.match(/^(?:(\s*[\$\w]+)|\(\s*([\$\w]+)\s*,\s*([\$\w]+)\s*\))$/);
         if (!match) {
           throw ngRepeatMinErr('iidexp', "'_item_' in '_item_ in _collection_' should be an identifier or '(_key_, _value_)' expression, but got '{0}'.",
                                                                     lhs);

test/ng/directive/ngRepeatSpec.js

@@ -109,6 +109,16 @@ describe('ngRepeat', function() {
     expect(element.text()).toEqual('misko:swe|shyam:set|');
   });
 
+  it('should iterate over on object/map where (key,value) contains whitespaces', function() {
+    element = $compile(
+      '<ul>' +
+        '<li ng-repeat="(  key ,  value  ) in items">{{key}}:{{value}}|</li>' +
+      '</ul>')(scope);
+    scope.items = {me:'swe', you:'set'};
+    scope.$digest();
+    expect(element.text()).toEqual('me:swe|you:set|');
+  });
+
   it('should iterate over an object/map with identical values', function() {
     element = $compile(
       '<ul>' +