How can I make this Leaner ?

toBundle.php

    <?php
    
    //TODO: MAke Gooder Codes here
    public function convertToBundle($str)
    {
        //$str = 'UE\Stampede\TestBundle\Controller\TestController::getTestsAction';
        /// find :: shift back to before controller
        // strip action
        $str = preg_replace('/Action/', '', $str);
        $str = preg_replace('/::/', ':', $str);
        $str = str_replace('\Controller\\', ':', $str);
        $str = preg_replace('/Controller/', '', $str);
        $str = str_replace('\\', '', $str);
        return $str;
    }