Thread: router question - how to hide default module, controller and action in url?

I created router
[PHP]$router = $frontController->getRouter();
$router->addRoute(
'url',
new Zend_Controller_Router_Route(':lang/:module/:category/:controller/:action/:test',
array('module'=>'default', 'controller' => 'index', 'action' => 'index', 'lang' => 'en', 'category'=> 'categ1'))
);[/PHP]

when url is http://domain/en/default/pc/index/index/something/ everything works fine. $this->getRequest(); output in Controller is
[PHP]["_paramsrotected"] => array(6) {
["lang"] => string(2) "en"
["module"] => string(7) "default"
["category"] => string(2) "pc"
["controller"] => string(5) "index"
["action"] => string(5) "index"
["test"] => string(9) "something"
}
[/PHP]
Problem occurs when I change url, for example remove default index controller and action http://domain/en/default/pc/something/

error is:
Fatal error: Uncaught exception 'Zend_Controller_Dispatcher_Exception' with message 'Invalid controller specified (en)' in C:\wamp\www\ZendFramework-1.0.3\library\Zend\Controller\Dispatcher\Standard. php:198 ...

What should I change in router definition if I want that results of these urls:
http://domain/en/default/pc/index/index/something/
http://domain/en/pc/index/index/something/
http://domain/en/pc/index/something/
http://domain/en/pc/something/
http://domain/pc/something/

be the same?:
[PHP]["_paramsrotected"] => array(6) {
["lang"] => string(2) "en"
["module"] => string(7) "default"
["category"] => string(2) "pc"
["controller"] => string(5) "index"
["action"] => string(5) "index"
["test"] => string(9) "something"
}[/PHP]