Fix SteamID regex syntax warnings

Author: Mirochill

steam/steamid.py

@@ -501,7 +501,7 @@ def from_csgo_friend_code(code, universe=EUniverse.Public):
     :return: SteamID instance
     :rtype: :class:`.SteamID` or :class:`None`
     """
-    if not re.match(r'^['+_csgofrcode_chars+'\-]{10}$', code):
+    if not re.match(r'^['+_csgofrcode_chars+r'\-]{10}$', code):
         return None
 
     code = ('AAAA-' + code).replace('-', '')
@@ -574,7 +574,7 @@ def steam64_from_url(url, http_timeout=30):
         # group profiles
         else:
             text = web.get(match.group('clean_url'), timeout=http_timeout).text
-            data_match = re.search("OpenGroupChat\( *'(?P<steamid>\d+)'", text)
+            data_match = re.search(r"OpenGroupChat\( *'(?P<steamid>\d+)'", text)
 
             if data_match:
                 return int(data_match.group('steamid'))

tests/test_steamid.py

@@ -337,6 +337,16 @@ def test_steam64_from_url_timeout(self, mrs_mock):
         mm.get.side_effect = requests.exceptions.ReadTimeout('test')
         self.assertIsNone(steamid.steam64_from_url("https://steamcommunity.com/id/timeout_me"))
 
+    @mock.patch('steam.steamid.make_requests_session')
+    def test_steam64_from_url_group_chat_markup(self, mrs_mock):
+        mm = mrs_mock.return_value = mock.MagicMock()
+        mm.get.return_value.text = "OpenGroupChat( '103582791429521412'"
+
+        self.assertEqual(
+            steamid.steam64_from_url("https://steamcommunity.com/groups/Valve"),
+            103582791429521412
+        )
+
     def test_steam64_from_url(self):
         def scrub_req(r):
             r.headers.pop('Cookie', None)