From 96c16bfb8533cf16a6e57c95e3b1c8ab998305a2 Mon Sep 17 00:00:00 2001
From: Min RK <benjaminrk@gmail.com>
Date: Mon, 4 Feb 2019 12:56:53 +0100
Subject: [PATCH] missing escape in normalize_timestamp

---
 jupyterhub/tests/test_api.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jupyterhub/tests/test_api.py b/jupyterhub/tests/test_api.py
index 444ff563..3ab07a1f 100644
--- a/jupyterhub/tests/test_api.py
+++ b/jupyterhub/tests/test_api.py
@@ -113,7 +113,7 @@ def normalize_timestamp(ts):
     """
     if ts is None:
         return
-    return re.sub('\d(\.\d+)?', '0', ts)
+    return re.sub(r'\d(\.\d+)?', '0', ts)
 
 
 def normalize_user(user):