Problem with route and URI Language code

[eluser]deck1[/eluser]
Thanks KeyStroke.

But i have some restrictions. I don't know the language code at this point (i will check later against DB), therefore i have to allow that pattern: "xx" or "xx-XX". And (and here comes the problem) both patterns are allowed, and both are optional.

If i try a single pattern, as yours, it works ok, but i have to allow both.