CakePHP Username URL using Regex?

I found a comment here: http://bakery.cakephp.org/articles/PHPdiddy/2006/10/06/custom-urls-from-the-site-root

That said:

Just change l开发者_开发百科ast line.

Router::connect('/', array('controller' => 'members', 'action' => 'show'));

to

Router::connect('(?!admin|items|images)(.*)', array('controller' => 'members', 'action' => 'show'));

Some people were able to get that to work... It didn't look quite right to me though so I tried the following, but still had no luck:

Router::connect('(?!/admin|/items|/images)(/.*)',
array('controller' => 'members','action' => 'show'));

In any case, the goal is to have a url like http://domainname/username , map to a users unique id. It works with /*, but I rather not use that method. Ideas?

Update to solution: I used the selected answer below and added the following. It may be helpful to someone else.

$misc = array(*your misc webroot, admin route items here...*);
$notList = array_merge(Configure::listObjects('plugin'),Configure::listObjects('controller'));
$notListLowerCase = array();
foreach ($notList as $key=>$item):
    $notListLowerCase[] = strtolower(preg_replace("/(.)([A-Z])/","\\1_\\2",$item));
endforeach;
$notList = array_merge($notList,$misc,$notListLowerCase);
$notList = implode('|', $notList);

Router::connect('/:username', 
        array(
            'controller'=>'users', 
            'action'=>'view'
        ),   
        array(
            'username' => '\b(?:(?!'.$notList.')\w)+\b'
        )
    );

---

Here ya go. You need to capture it as a param and then reference it in the regex. The username will be available in $this->params['username'] in the controller action.

Router::connect('/:username', 
    array(
        'controller'=>'members', 
        'action'=>'show'
    ),   
    array(
        'username' => '\b(?:(?!admin|items|images)\w)+\b'
    )
);

---

$misc = array(*your misc webroot, admin route items here...*);
    $notList = array_merge(App::objects('plugin'),str_replace('Controller','',App::objects('controller')));
    $notListLowerCase = array();
    foreach ($notList as $key=>$item):
        $notListLowerCase[] = strtolower(preg_replace("/(.)([A-Z])/","\\1_\\2",$item));
    endforeach;
    $notList = array_merge($notList,$misc,$notListLowerCase);
    $notList = implode('|', $notList);
    Router::connect('/:username', array('controller' => 'members', 'action' => 'show'),array('pass'=>array('username'),'username'=>'\b(?:(?!'.$notList.')\w)+\b'));