Problem with route and URI Language code

[eluser]deck1[/eluser]
Hi,

I'm having problems with the following route:

Code:

$route["([a-z]{2}(?:-[A-Z]{2})?/?)?(.*)"] ='$2';

I want urls with language code in the first segment, but that code may be "en" or "en-US" or nothing.

It works ok for the following URLs:
http://www.domain.com/
http://www.domain.com/en
http://www.domain.com/en/
http://www.domain.com/en/controller/...
http://www.domain.com/en-US
http://www.domain.com/en-US/
http://www.domain.com/en-US/controller/...


But fails (returns 404 page) with:
http://www.domain.com/controller/...


I have tried almost everything but i don't get it to work.

any suggestions?

Thanks in advance.