diff --git a/gen/openapi_server/__main__.py b/gen/openapi_server/__main__.py
index 2cbf68b..07ee72a 100644
--- a/gen/openapi_server/__main__.py
+++ b/gen/openapi_server/__main__.py
@@ -19,11 +19,7 @@ app = connexion.FlaskApp(__name__, specification_dir='./openapi/')
 app.add_middleware(
     CORSMiddleware,
     position=MiddlewarePosition.BEFORE_EXCEPTION,
-    allow_origins_regex=[
-        "^https://[a-zA-Z0-9.-]+\\.kanzleiapp\\.io$",
-        "^https://[a-zA-Z0-9.-]+\\.masasana\\.ai$",
-        "^http://localhost:4200$"
-    ],
+    allow_origins_regex=r"^(https?://)(.*kanzleiapp\.io|.*masasana\.ai|localhost:4200)$",
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],