following Niphlod's advice in app.example.yaml regex syntax

examples/app.example.yaml

@@ -21,8 +21,8 @@ handlers:
 # the parametric router's language logic. 
 # You cannot use them together.
 
-- url: /(.+?)/static/_[\d]+.[\d]+.[\d]+\/(.+)
+- url: /(.+?)/static/_(\d+\.\d+\.\d+)\/(.+)
-  static_files: applications/\1/static/\2
+  static_files: applications/\1/static/\3
   upload: applications/(.+?)/static/(.+)
   secure: optional
   expiration: "365d"