Refs #27025 -- Fixed "invalid escape sequence" warnings in Python 3.6.

http://bugs.python.org/issue27364

django/contrib/admindocs/urls.py

@@ -2,31 +2,31 @@ from django.conf.urls import url
 from django.contrib.admindocs import views
 
 urlpatterns = [
-    url('^$',
+    url(r'^$',
         views.BaseAdminDocsView.as_view(template_name='admin_doc/index.html'),
         name='django-admindocs-docroot'),
-    url('^bookmarklets/$',
+    url(r'^bookmarklets/$',
         views.BookmarkletsView.as_view(),
         name='django-admindocs-bookmarklets'),
-    url('^tags/$',
+    url(r'^tags/$',
         views.TemplateTagIndexView.as_view(),
         name='django-admindocs-tags'),
-    url('^filters/$',
+    url(r'^filters/$',
         views.TemplateFilterIndexView.as_view(),
         name='django-admindocs-filters'),
-    url('^views/$',
+    url(r'^views/$',
         views.ViewIndexView.as_view(),
         name='django-admindocs-views-index'),
-    url('^views/(?P<view>[^/]+)/$',
+    url(r'^views/(?P<view>[^/]+)/$',
         views.ViewDetailView.as_view(),
         name='django-admindocs-views-detail'),
-    url('^models/$',
+    url(r'^models/$',
         views.ModelIndexView.as_view(),
         name='django-admindocs-models-index'),
-    url('^models/(?P<app_label>[^\.]+)\.(?P<model_name>[^/]+)/$',
+    url(r'^models/(?P<app_label>[^\.]+)\.(?P<model_name>[^/]+)/$',
         views.ModelDetailView.as_view(),
         name='django-admindocs-models-detail'),
-    url('^templates/(?P<template>.*)/$',
+    url(r'^templates/(?P<template>.*)/$',
         views.TemplateDetailView.as_view(),
         name='django-admindocs-templates'),
 ]

django/contrib/admindocs/views.py

@@ -430,7 +430,7 @@ non_named_group_matcher = re.compile(r'\(.*?\)')
 
 
 def simplify_regex(pattern):
-    """
+    r"""
     Clean up urlpattern regexes into something more readable by humans. For
     example, turn "^(?P<sport_slug>\w+)/athletes/(?P<athlete_slug>\w+)/$"
     into "/<sport_slug>/athletes/<athlete_slug>/".