From 0a495cb485ba5bb8bb81dc95fa760b10957b6175 Mon Sep 17 00:00:00 2001
From: Jerome Leclanche <jerome@leclan.ch>
Date: Sun, 4 Jun 2017 14:32:59 +0300
Subject: [PATCH] Fix PolymorphicParentModelAdmin.pk_regex escape

---
 polymorphic/admin/parentadmin.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/polymorphic/admin/parentadmin.py b/polymorphic/admin/parentadmin.py
index dd37e40..d156ca2 100644
--- a/polymorphic/admin/parentadmin.py
+++ b/polymorphic/admin/parentadmin.py
@@ -61,7 +61,7 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
     #: The regular expression to filter the primary key in the URL.
     #: This accepts only numbers as defensive measure against catch-all URLs.
     #: If your primary key consists of string values, update this regular expression.
-    pk_regex = '(\d+|__fk__)'
+    pk_regex = r"(\d+|__fk__)"
 
     def __init__(self, model, admin_site, *args, **kwargs):
         super(PolymorphicParentModelAdmin, self).__init__(model, admin_site, *args, **kwargs)