zend框架中的Regex路由器,如何使这些路由器合并?

        $route = new Zend_Controller_Router_Route_Regex(
        '([a-z]{2})/(\w+)/(\w+)/(\w+)',
        array('controller'=>'index',
            'action' => 'index',
            'module'=>'default',
            'lang'=>$lang
        ),
        array(
            1=>'lang',
            2=>'module',
            3=>'controller',
            4=>'action'
        )
    );
    $router->addRoute('default_lang_action', $route);

    $route = new Zend_Controller_Router_Route_Regex(
        '([a-z]{2})/(\w+)/(\w+)',
        array('controller'=>'index',
            'action' => 'index',
            'module'=>'login',
            'lang'=>$lang
        ),
        array(
            1=>'lang',
            2=>'module',
            3=>'controller'
           )
    );
    $router->addRoute('default_lang_con', $route);

    $route = new Zend_Controller_Router_Route_Regex(
        '([a-z]{2})/(\w+)',
        array('controller'=>'index',
            'action' => 'index',
            'module'=>'default',
            'lang'=>$lang
        ),
        array(
            1=>'lang',
            2=>'module'
        )
    );
    $router->addRoute('default_lang_mod', $route);

    $route = new Zend_Controller_Router_Route_Regex(
        '([a-z]{2})',
        array('controller'=>'index',
            'action' => 'index',
            'module'=>'default',
            'lang'=>$lang
        ),
        array(
            1=>'lang'
        )
    );
            $router->addRoute('default_lang', $route);