normalizing ?ver= css and js

[Miguel Gonzalez]

Dear all,
  I have Varnish 4 installed, in vcl_recv I have added this line:
  set req.url = regsub(req.url, "\?ver=.*$", "");
  
  which supposedly normalizes all css and js ?ver=xxxx strings. 
   However tools.pingdom.com reports there are still css and js files being delivered with those strings.
  What am I doing wrong?
  Thanks!  
   Miguel

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