Index: tests/regressiontests/templates/tests.py
===================================================================
--- tests/regressiontests/templates/tests.py	(revision 6978)
+++ tests/regressiontests/templates/tests.py	(working copy)
@@ -807,15 +807,30 @@
                           '{% endfor %},' + \
                           '{% endfor %}',
                           {}, ''),
+
+            # Test for regroup with filter on the "by" argument
+            'regroup03': ('{% regroup data by bar|date:"F Y" as grouped %}' + \
+                          '{% for group in grouped %}' + \
+                          '{{ group.grouper }}:' + \
+                          '{% for item in group.list %}' + \
+                          '{{ item.foo }}' + \
+                          '{% endfor %},' + \
+                          '{% endfor %}',
+                          {'data': [ {'foo':'c', 'bar':datetime(2000,1,1)},
+                                     {'foo':'d', 'bar':datetime(2000,1,1)},
+                                     {'foo':'a', 'bar':datetime(2000,2,1)},
+                                     {'foo':'b', 'bar':datetime(2000,2,1)},
+                                     {'foo':'x', 'bar':datetime(2000,3,1)} ]},
+                          'Jan 2000:cd,Feb 2000:ab,Mar 2000:x,'),
             
             # Test syntax.
-            'regroup03': ('{% regroup data by bar as %}', {},
+            'regroup04': ('{% regroup data by bar as %}', {},
                           template.TemplateSyntaxError),
-            'regroup04': ('{% regroup data by bar thisaintright grouped %}', {},
+            'regroup05': ('{% regroup data by bar thisaintright grouped %}', {},
                           template.TemplateSyntaxError),
-            'regroup05': ('{% regroup data thisaintright bar as grouped %}', {},
+            'regroup06': ('{% regroup data thisaintright bar as grouped %}', {},
                           template.TemplateSyntaxError),
-            'regroup06': ('{% regroup data by bar as grouped toomanyargs %}', {},
+            'regroup07': ('{% regroup data by bar as grouped toomanyargs %}', {},
                           template.TemplateSyntaxError),
 
             ### TEMPLATETAG TAG #######################################################