[PR #8998/875f23d5 backport][3.10] Fix resource reuse with regex paths (

#9016)

**This is a backport of PR #8998 as merged into master
(875f23d).**

Co-authored-by: Sam Bull <git@sambull.org>

CHANGES/8998.bugfix.rst

@@ -0,0 +1 @@
+Fixed an error when trying to add a route for multiple methods with a path containing a regex pattern -- by :user:`Dreamsorcerer`.

aiohttp/web_urldispatcher.py

@@ -456,6 +456,7 @@ class DynamicResource(Resource):
 
     def __init__(self, path: str, *, name: Optional[str] = None) -> None:
         super().__init__(name=name)
+        self._orig_path = path
         pattern = ""
         formatter = ""
         for part in ROUTE_RE.split(path):
@@ -508,7 +509,7 @@ def _match(self, path: str) -> Optional[Dict[str, str]]:
             }
 
     def raw_match(self, path: str) -> bool:
-        return self._formatter == path
+        return self._orig_path == path
 
     def get_info(self) -> _InfoDict:
         return {"formatter": self._formatter, "pattern": self._pattern}

tests/test_web_urldispatcher.py

@@ -703,10 +703,11 @@ async def handler(request: web.Request) -> web.Response:
 
 @pytest.mark.parametrize(
     "path",
-    [
+    (
         "/a",
         "/{a}",
-    ],
+        "/{a:.*}",
+    ),
 )
 def test_reuse_last_added_resource(path: str) -> None:
     # Test that adding a route with the same name and path of the last added