Converting subdomain to path component without redirect ?

Hello guys,

Am having trouble setting up my nginx.config to transparently proxy the
subdomains and domains to the same app, but with different "path
components" appended to the $uri

example:
mydomain.it/PATH should return ~> mydomain.com/it/PATH

using regexp:
(www\.)?mydomain\.(it|jp|es|de) to return my
http://app_server/$2/$request_uri

My idea is to proxy the "localised server_name" to the "default
server_name" without letting the user know ( no browser redirect ).

This is my "working" nginx.config ( without the rukes ):
http://pastebin.com/v9pcVR4e

This is my last unsuccessful attempt: http://pastebin.com/bZZA30zC

any input is highly appreciated

thanks a lot,
peace
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