diff --git a/fastapi/utils.py b/fastapi/utils.py
index b7da3e484240c..0ced0125223a4 100644
--- a/fastapi/utils.py
+++ b/fastapi/utils.py
@@ -140,14 +140,14 @@ def generate_operation_id_for_path(
         stacklevel=2,
     )
     operation_id = name + path
-    operation_id = re.sub("[^0-9a-zA-Z_]", "_", operation_id)
+    operation_id = re.sub(r"\W", "_", operation_id)
     operation_id = operation_id + "_" + method.lower()
     return operation_id
 
 
 def generate_unique_id(route: "APIRoute") -> str:
     operation_id = route.name + route.path_format
-    operation_id = re.sub("[^0-9a-zA-Z_]", "_", operation_id)
+    operation_id = re.sub(r"\W", "_", operation_id)
     assert route.methods
     operation_id = operation_id + "_" + list(route.methods)[0].lower()
     return operation_id