Allow path to contain regex meta characters (#932)

* Allow path to contain regex meta characters

starlette/routing.py

@@ -107,7 +107,7 @@ def compile_path(
         ), f"Unknown path convertor '{convertor_type}'"
         convertor = CONVERTOR_TYPES[convertor_type]
 
-        path_regex += path[idx : match.start()]
+        path_regex += re.escape(path[idx : match.start()])
         path_regex += f"(?P<{param_name}>{convertor.regex})"
 
         path_format += path[idx : match.start()]
@@ -117,7 +117,7 @@ def compile_path(
 
         idx = match.end()
 
-    path_regex += path[idx:] + "$"
+    path_regex += re.escape(path[idx:]) + "$"
     path_format += path[idx:]
 
     return re.compile(path_regex), path_format, param_convertors

tests/test_routing.py

@@ -83,6 +83,13 @@ def uuid_converter(request):
     return JSONResponse({"uuid": str(uuid_param)})
 
 
+# Route with chars that conflict with regex meta chars
+@app.route("/path-with-parentheses({param:int})", name="path-with-parentheses")
+def path_with_parentheses(request):
+    number = request.path_params["param"]
+    return JSONResponse({"int": number})
+
+
 @app.websocket_route("/ws")
 async def websocket_endpoint(session):
     await session.accept()
@@ -146,6 +153,15 @@ def test_route_converters():
     assert response.json() == {"int": 5}
     assert app.url_path_for("int-convertor", param=5) == "/int/5"
 
+    # Test path with parentheses
+    response = client.get("/path-with-parentheses(7)")
+    assert response.status_code == 200
+    assert response.json() == {"int": 7}
+    assert (
+        app.url_path_for("path-with-parentheses", param=7)
+        == "/path-with-parentheses(7)"
+    )
+
     # Test float conversion
     response = client.get("/float/25.5")
     assert response.status_code == 200