Split warns matching string in multiple lines

testing/deprecated_test.py

@@ -183,7 +183,10 @@ def test_hookproxy_warnings_for_fspath(tmp_path, hooktype, request):
 def test_warns_none_is_deprecated():
     with pytest.warns(
         PytestDeprecationWarning,
-        match=r"Passing None to catch any warning has been deprecated, pass no arguments instead:\n Replace pytest.warns\(None\) by simply pytest.warns\(\).",
+        match=re.escape(
+            "Passing None to catch any warning has been deprecated, pass no arguments instead:\n "
+            "Replace pytest.warns(None) by simply pytest.warns()."
+        ),
     ):
         with pytest.warns(None):
             pass