diff --git a/dist/angular-filter.js b/dist/angular-filter.js
index f50d9f9..6bc0558 100644
--- a/dist/angular-filter.js
+++ b/dist/angular-filter.js
@@ -1,6 +1,6 @@
 /**
  * Bunch of useful filters for angularJS(with no external dependencies!)
- * @version v0.5.7 - 2015-10-04 * @link https://github.com/a8m/angular-filter
+ * @version v0.5.8 - 2015-12-21 * @link https://github.com/a8m/angular-filter
  * @author Ariel Mashraki <ariel@mashraki.co.il>
  * @license MIT License, http://www.opensource.org/licenses/MIT
  */
@@ -622,7 +622,7 @@ angular.module('a8m.every', [])
  */
 angular.module('a8m.filter-by', [])
   .filter('filterBy', ['$parse', function( $parse ) {
-    return function(collection, properties, search) {
+    return function(collection, properties, search, strict) {
       var comparator;
 
       search = (isString(search) || isNumber(search)) ?
@@ -646,16 +646,19 @@ angular.module('a8m.filter-by', [])
           if(!~prop.indexOf('+')) {
             comparator = $parse(prop)(elm)
           } else {
-            var propList = prop.replace(new RegExp('\\s', 'g'), '').split('+');
-            comparator = propList.reduce(function(prev, cur, index) {
-              return (index === 1) ? $parse(prev)(elm) + ' ' + $parse(cur)(elm) :
-                prev + ' ' + $parse(cur)(elm);
-            });
+            var propList = prop.replace(/\s+/g, '').split('+');
+            comparator = propList
+              .map(function(prop) { return $parse(prop)(elm); })
+              .join(' ');
           }
 
-          return (isString(comparator) || isNumber(comparator))
-            ? String(comparator).toLowerCase().contains(search)
-            : false;
+          if (!isString(comparator) && !isNumber(comparator)) {
+            return false;
+          }
+
+          comparator = String(comparator).toLowerCase();
+
+          return strict ? comparator === search : comparator.contains(search);
         });
       });
     }
@@ -848,6 +851,7 @@ angular.module('a8m.fuzzy', [])
  * each key is an array of the elements.
  */
 
+
 angular.module('a8m.group-by', [ 'a8m.filter-watcher' ])
   .filter('groupBy', [ '$parse', 'filterWatcher', function ( $parse, filterWatcher ) {
     return function (collection, property) {
@@ -856,22 +860,38 @@ angular.module('a8m.group-by', [ 'a8m.filter-watcher' ])
         return collection;
       }
 
-      return filterWatcher.isMemoized('groupBy', arguments) ||
-        filterWatcher.memoize('groupBy', arguments, this,
-          _groupBy(collection, $parse(property)));
+      if (filterWatcher.isMemoized('groupBy', arguments))
+        return filterWatcher.isMemoized('groupBy', arguments);
+
+      var getters = [];
+      if (angular.isArray(property)) {
+        forEach(property, function(prop) {
+          getters.push($parse(prop));
+        })
+      } else {
+        getters.push($parse(property));
+      }
+      return filterWatcher.memoize('groupBy', arguments, this,
+        _groupBy(collection, getters));
 
       /**
        * groupBy function
        * @param collection
-       * @param getter
+       * @param getters
        * @returns {{}}
        */
-      function _groupBy(collection, getter) {
+      function _groupBy(collection, getters) {
         var result = {};
-        var prop;
 
         forEach( collection, function( elm ) {
-          prop = getter(elm);
+          var prop = [];
+
+          forEach(getters, function(getter) {
+            var p = getter(elm);
+            if (angular.isUndefined(p))
+              p = 'undefined';
+            prop.push(p); 
+          })
 
           if(!result[prop]) {
             result[prop] = [];
diff --git a/dist/angular-filter.min.js b/dist/angular-filter.min.js
index 11714a5..365525b 100644
--- a/dist/angular-filter.min.js
+++ b/dist/angular-filter.min.js
@@ -1,6 +1,6 @@
 /**
  * Bunch of useful filters for angularJS(with no external dependencies!)
- * @version v0.5.7 - 2015-10-04 * @link https://github.com/a8m/angular-filter
+ * @version v0.5.8 - 2015-12-21 * @link https://github.com/a8m/angular-filter
  * @author Ariel Mashraki <ariel@mashraki.co.il>
  * @license MIT License, http://www.opensource.org/licenses/MIT
- */!function(a,b,c){"use strict";function d(a){return D(a)?a:Object.keys(a).map(function(b){return a[b]})}function e(a){return null===a}function f(a,b){var d=Object.keys(a);return-1==d.map(function(d){return b[d]!==c&&b[d]==a[d]}).indexOf(!1)}function g(a,b){if(""===b)return a;var c=a.indexOf(b.charAt(0));return-1===c?!1:g(a.substr(c+1),b.substr(1))}function h(a,b,c){var d=0;return a.filter(function(a){var e=x(c)?b>d&&c(a):b>d;return d=e?d+1:d,e})}function i(a,b,c){return c.round(a*c.pow(10,b))/c.pow(10,b)}function j(a,b,c){b=b||[];var d=Object.keys(a);return d.forEach(function(d){if(C(a[d])&&!D(a[d])){var e=c?c+"."+d:c;j(a[d],b,e||d)}else{var f=c?c+"."+d:d;b.push(f)}}),b}function k(a){return a&&a.$evalAsync&&a.$watch}function l(){return function(a,b){return a>b}}function m(){return function(a,b){return a>=b}}function n(){return function(a,b){return b>a}}function o(){return function(a,b){return b>=a}}function p(){return function(a,b){return a==b}}function q(){return 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j={},l={},m=a.setTimeout;return{isMemoized:h,memoize:i}}]}),b.module("angular.filter",["a8m.ucfirst","a8m.uri-encode","a8m.uri-component-encode","a8m.slugify","a8m.latinize","a8m.strip-tags","a8m.stringular","a8m.truncate","a8m.starts-with","a8m.ends-with","a8m.wrap","a8m.trim","a8m.ltrim","a8m.rtrim","a8m.repeat","a8m.test","a8m.match","a8m.to-array","a8m.concat","a8m.contains","a8m.unique","a8m.is-empty","a8m.after","a8m.after-where","a8m.before","a8m.before-where","a8m.defaults","a8m.where","a8m.reverse","a8m.remove","a8m.remove-with","a8m.group-by","a8m.count-by","a8m.chunk-by","a8m.search-field","a8m.fuzzy-by","a8m.fuzzy","a8m.omit","a8m.pick","a8m.every","a8m.filter-by","a8m.xor","a8m.map","a8m.first","a8m.last","a8m.flatten","a8m.join","a8m.range","a8m.math","a8m.math.max","a8m.math.min","a8m.math.percent","a8m.math.radix","a8m.math.sum","a8m.math.degrees","a8m.math.radians","a8m.math.byteFmt","a8m.math.kbFmt","a8m.math.shortFmt","a8m.angular","a8m.conditions","a8m.is-null","a8m.filter-watcher"])}(window,window.angular);
\ No newline at end of file
diff --git a/dist/angular-filter.zip b/dist/angular-filter.zip
index 7f18b4d..faca272 100644
Binary files a/dist/angular-filter.zip and b/dist/angular-filter.zip differ
diff --git a/src/_filter/collection/group-by.js b/src/_filter/collection/group-by.js
index 5832098..90ee867 100644
--- a/src/_filter/collection/group-by.js
+++ b/src/_filter/collection/group-by.js
@@ -8,6 +8,7 @@
  * each key is an array of the elements.
  */
 
+
 angular.module('a8m.group-by', [ 'a8m.filter-watcher' ])
   .filter('groupBy', [ '$parse', 'filterWatcher', function ( $parse, filterWatcher ) {
     return function (collection, property) {
@@ -16,22 +17,38 @@ angular.module('a8m.group-by', [ 'a8m.filter-watcher' ])
         return collection;
       }
 
-      return filterWatcher.isMemoized('groupBy', arguments) ||
-        filterWatcher.memoize('groupBy', arguments, this,
-          _groupBy(collection, $parse(property)));
+      if (filterWatcher.isMemoized('groupBy', arguments))
+        return filterWatcher.isMemoized('groupBy', arguments);
+
+      var getters = [];
+      if (angular.isArray(property)) {
+        forEach(property, function(prop) {
+          getters.push($parse(prop));
+        })
+      } else {
+        getters.push($parse(property));
+      }
+      return filterWatcher.memoize('groupBy', arguments, this,
+        _groupBy(collection, getters));
 
       /**
        * groupBy function
        * @param collection
-       * @param getter
+       * @param getters
        * @returns {{}}
        */
-      function _groupBy(collection, getter) {
+      function _groupBy(collection, getters) {
         var result = {};
-        var prop;
 
         forEach( collection, function( elm ) {
-          prop = getter(elm);
+          var prop = [];
+
+          forEach(getters, function(getter) {
+            var p = getter(elm);
+            if (angular.isUndefined(p))
+              p = 'undefined';
+            prop.push(p); 
+          })
 
           if(!result[prop]) {
             result[prop] = [];
diff --git a/test/spec/filter/collection/group-by.js b/test/spec/filter/collection/group-by.js
index a01e454..cb1d373 100644
--- a/test/spec/filter/collection/group-by.js
+++ b/test/spec/filter/collection/group-by.js
@@ -66,6 +66,26 @@ describe('groupByFilter', function() {
     expect(filter(null)).toBeNull();
   });
 
+  it('should allow groupBy multiple key', function() {
+    var arrays = [
+      { key1: 1, key2: 1, data: {} },
+      { key1: 1, key2: 1, data: {} },
+      { key1: 1, key2: 2, data: {} },
+      { key1: 1, key2: 2, data: {} },
+      { key1: 2, key2: 3, data: {} },
+      { key1: 2, key2: 3, data: {} },
+      { key1: 2, key2: 4, data: {} },
+      { key1: 2, key2: 4, data: {} }
+    ];
+
+    expect(filter(arrays, ['key1', 'key2'])).toEqual({
+      '1,1': [arrays[0], arrays[1]],
+      '1,2': [arrays[2], arrays[3]],
+      '2,3': [arrays[4], arrays[5]],
+      '2,4': [arrays[6], arrays[7]]
+    });
+  });
+
   describe('inside the DOM', function() {
     it('should not throw and not trigger the infinite digest exception',
       inject(function($rootScope, $compile) {