symfony/tests/Symfony/Tests/Component/Routing/Fixtures/validpattern.php

<?php
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;

$collection = new RouteCollection();
$collection->add('blog_show', new Route('/blog/{slug}', array(
    '_controller' => 'MyBlogBundle:Blog:show',
)));

return $collection;