Routes add variable

Hi,

in your movie you show how we can add variables to route (https://www.youtube.com/watch?v=iEpIVOAeaHw).

In routes.php i add:
$this->get('profil/(:str)', 'demo/profil/$1');

and in controller demo.php i add:
public function profil($id) {
print $id;
}

and when i try check it (localhost/profil/dsdas) i see:
$1

whats wrong?

I found an error.

in system/Router.php (line 116) is:
for($i=2;$i<count($this->_tmp);$i++){

but should be:
for($i=1;$i<count($this->_tmp);$i++){