Possible rewrite regular expression bug?

[Peter Hoang]

Furthermore, it seems like NGINX seems to decode the parameter in 
rewrite rules. For example, I have the following rule:

      if ($args ~ ^q=([^&]+)$) {
        set $q $1;
        rewrite ^/j /cms/q-$q.html? permanent;
      }

Now if I enter the http://localhost/j?q=c%2B%2B then NGINX will redirect 
me to http://localhost/cms/q-c++.html . I was expected that the final 
url would be http://localhost/cms/q-%2B%2B.html. Is there a way to 
prevent this from happening? Thanks.
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