Silex尾随斜线

Question

I have wrapped Silex around a legacy app. My index.php looks like this:

$app->match('/{page}/{action}/{part}/{detail}', function($page, $action, $part, $detail) {
})
    ->value('page', 'backoffice')
    ->value('action', null)
    ->value('part', null)
    ->value('detail', null)
;

The problem I'm facing is that there are a lot of URLs that have trailing slashes. For example http://site/contact/ or http://site/backoffice/erp/

When there is a trailing slash the Silex route does not work. Does anyone know how I can fix this?