wallabag/src/Wallabag/CoreBundle/Twig/WallabagExtension.php

<?php

namespace Wallabag\CoreBundle\Twig;

class WallabagExtension extends \Twig_Extension
{
    public function getFilters()
    {
        return array(
            new \Twig_SimpleFilter('removeWww', array($this, 'removeWww')),
        );
    }

    public function removeWww($url)
    {
        return preg_replace('/^www\./i', '',$url);
    }

    public function getName()
    {
        return 'wallabag_extension';
    }
}