From f99beefdf45dd2891bb7ebdd93f7a67e44623aee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gonzalo=20Tornar=C3=ADa?= <tornaria@cmat.edu.uy>
Date: Tue, 21 Dec 2021 14:54:24 -0300
Subject: [PATCH] Fix deprecation warning

In sagemath, while doctesting `src/sage/repl/ipython_kernel/install.py`:

> DeprecationWarning: invalid escape sequence '\s'

The solution is to make the regex a raw string.
---
 notebook/auth/login.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/notebook/auth/login.py b/notebook/auth/login.py
index 1ac434dc5..16c4e7a35 100644
--- a/notebook/auth/login.py
+++ b/notebook/auth/login.py
@@ -112,7 +112,7 @@ class LoginHandler(IPythonHandler):
         handler.set_secure_cookie(handler.cookie_name, user_id, **cookie_options)
         return user_id
 
-    auth_header_pat = re.compile('token\s+(.+)', re.IGNORECASE)
+    auth_header_pat = re.compile(r'token\s+(.+)', re.IGNORECASE)
 
     @classmethod
     def get_token(cls, handler):