URL parameters in plugin

I am trying to capture a url parameter as a variable in a plugin, but my current method doesn't seem to work.

my url parameter http://mysite.com/filter/role:data-owner

accessing the url parameter $this->grav['uri.param']

Help please.

@crusnac You might try the following:

$this->grav['uri']->param('role');

'param()' is a method of class Uri.