diff --git a/billard/urls.py b/billard/urls.py
index 88af92e..b02463d 100644
--- a/billard/urls.py
+++ b/billard/urls.py
@@ -19,7 +19,7 @@ urlpatterns = [
     # ex. /billard/1/account_modal/
     url(r'^(?P<loc_pk>[0-9]+)/account_modal/$', views.account_modal_view, name='account_modal'),
     # ex. /billard/1/account_modal/confirm/
-    url(r'^(?P<loc_pk>[0-9]+)/account_modal/(?P<pks>([0-9],)+)/confirm/$', views.account_modal_confirm_view,
+    url(r'^(?P<loc_pk>[0-9]+)/account_modal/(?P<pks>[0-9]+(,[0-9]+)*)/confirm/$', views.account_modal_confirm_view,
         name='account_modal_confirm'),
     # ex. /billard/api/v1/ (rest api)
     url(r'api/v1/', include(router.urls)),