rewrite rule with ? in url

[extremecarver]

Hi - I've got a plugin which was misconfigured - and now I need to rewrite a
string - however I cannot find out at all how to do this for urls with ? in
them.

So I need to have:
www.velomap.org/de/?s2member_paypal_notify=1
rewritten to www.velomap.org/?s2member_paypal_notify=1
(note the /de missing).

I tried:
server { server_name www.velomap.org/de/?s2member_paypal_notify=1
 		return 301
$scheme://www.velomap.org/?s2member_paypal_notify=1$request_uri?; 
 }

but this is not accepted as valid nginx.conf...

So I need this rewritten and it is important that whatever string is
following this is not lost...


(also - but less important) - how can I rewrite a specific url?
So I want to rewrite
www.velomap.org/de/
to www.velomap.org 
- but only if it is exactly this url. www.velomap.org/de as well as
www.velomap.org/de/* is not allowed to be rewritten...

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,258420,258420#msg-258420