get the controller from the named argument

I have a named argument in my URLs, so it could look like this:

/subdomain:www/home
/subdomain:forum/topic/23

etc..

now I want that some of those named-arguments go to certain
controllers and all the others go the pages-controller
but I am a complete noob when it comes to routing. I tried this, but
obviously it doesn't work:

Router::connect('/:subdomain/*', array('subdomain' => 'forum',
'controller' => 'forum'));
Router::connect('/:subdomain/*', array('subdomain' => 'wiki',
'controller' => 'wiki'));
Router::connect('/:subdomain/*', array('subdomain' => 'docs',
'controller' => 'docs'));
Router::connect('/:subdomain/*', array('subdomain' => '*',
'controller' => 'pages'));
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