Unnamed

I have these URL's: 
/event/kind/thomas-de-stoomlocomotief/562

and I want to rewrite these urls to:
/event/562/kind/thomas-de-stoomlocomotief

(so basically position of numerics is changed...)

how can I do this in nginx?
I tried something like this:

        location /event {
                rewrite ^([a-zA-z-_]+)/([a-zA-z-_]+)/([0-9]+).*$ http://www.liveat.nl/event/$3/$1/$2 permanent;
        }

but doesnt seem to be working :S