How can i write this location?

[Chancey]

Hi guys!

How to set expires the URL like http://a.com/a.js?v=xxx and http://a.com/a.css?v=xxx.
only match URL with "?v="

i write this, but can't invalidation :

        location ~* \.(js|css)\?v=.* {
                expires 1y;
        }

2009-09-08 



Chancey 
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