How to bypass first segment in routing?

[eluser]Chicken's Egg[/eluser]
What about putting the following line in your configuration routes.php file:
<?php
$route['([a-z]{2})/(.[^/]+/.[^/]+)/(:any)'] = "$2/$1/$3/";
?>

Goal:
Rewrite: domein/fr/controller/method/any to domein/controller/method/fr/any.