Use raw string for regexp
diff --git a/Lib/test/test_asyncio/test_streams.py b/Lib/test/test_asyncio/test_streams.py
index 1783d5f..35557c3 100644
--- a/Lib/test/test_asyncio/test_streams.py
+++ b/Lib/test/test_asyncio/test_streams.py
@@ -831,7 +831,7 @@
stream._waiter = asyncio.Future(loop=self.loop)
self.assertRegex(
repr(stream),
- "<StreamReader w=<Future pending[\S ]*>>")
+ r"<StreamReader w=<Future pending[\S ]*>>")
stream._waiter.set_result(None)
self.loop.run_until_complete(stream._waiter)
stream._waiter = None