diff --git a/examples/app.example.yaml b/examples/app.example.yaml
index 46cf7bb0..5b3dac7f 100644
--- a/examples/app.example.yaml
+++ b/examples/app.example.yaml
@@ -21,7 +21,7 @@ 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
   upload: applications/(.+?)/static/(.+)
   secure: optional