Bug 1672668 [wpt PR 26184] - Python 3: replace deprecated Assertregexpmatches use for Py3, a=testonly

Automatic update from web-platform-tests
Python 3: replace deprecated Assertregexpmatches use for Py3 (#26184)

--

wpt-commits: 38a1e0ae8147790ff3f9c6314dbca88be62299d0
wpt-pr: 26184

testing/web-platform/tests/tools/wptserve/tests/functional/test_pipes.py

@@ -3,6 +3,7 @@ import unittest
 import time
 import json
 
+from six import assertRegex
 from six.moves import urllib
 
 import pytest
@@ -43,11 +44,11 @@ class TestHeader(TestUsingServer):
         self.assertEqual(resp.info()["Refresh"], "3;url=http://example.com")
 
     def test_escape_comma(self):
-        resp = self.request("/document.txt", query="pipe=header(Expires,Thu\,%2014%20Aug%201986%2018:00:00%20GMT)")
+        resp = self.request("/document.txt", query=r"pipe=header(Expires,Thu\,%2014%20Aug%201986%2018:00:00%20GMT)")
         self.assertEqual(resp.info()["Expires"], "Thu, 14 Aug 1986 18:00:00 GMT")
 
     def test_escape_parenthesis(self):
-        resp = self.request("/document.txt", query="pipe=header(User-Agent,Mozilla/5.0%20(X11;%20Linux%20x86_64;%20rv:12.0\)")
+        resp = self.request("/document.txt", query=r"pipe=header(User-Agent,Mozilla/5.0%20(X11;%20Linux%20x86_64;%20rv:12.0\)")
         self.assertEqual(resp.info()["User-Agent"], "Mozilla/5.0 (X11; Linux x86_64; rv:12.0)")
 
 class TestSlice(TestUsingServer):
@@ -120,7 +121,7 @@ server: http://localhost:{0}""".format(self.server.port).encode("ascii")
 
     def test_sub_uuid(self):
         resp = self.request("/sub_uuid.sub.txt")
-        self.assertRegexpMatches(resp.read().rstrip(), b"Before [a-f0-9-]+ After")
+        assertRegex(self, resp.read().rstrip(), b"Before [a-f0-9-]+ After")
 
     def test_sub_var(self):
         resp = self.request("/sub_var.sub.txt")