Zend Framework Route Chaining not work as expected - zend-framework

Question

I'm using ZF 1.11 for my project.
This is my routing configuration:
public function _initRoutes() {
$frontController = Zend_Controller_Front::getInstance();
$frontController->throwExceptions(false);
$router = $frontController->getRouter(); // returns a rewrite router by default
$langRoute = new Zend_Controller_Router_Route(
':lang/', array(
'lang' => 'vn'
)
);
$manufactureRoute = new Zend_Controller_Router_Route_Regex(
'manufacture/(\d+)-(.+).html',
array(
'module' => 'default',
'controller' => 'index',
'action' => 'filter'
),
array(
'1' => 'manufacture_id',
'2' => 'manufacture_name',
),
'manufacture/%d-%s.html'
);
$manufactureRoute = $langRoute->chain($manufactureRoute);
$router->addRoute('manufactureRoute', $manufactureRoute);
$frontController->setRouter($router);
}
When user access URLs like :
http://mydomain.vn/**vn**/manufacture/1-apple.html
everything works well as expected.
But the URLs like these below work well too.
http://mydomain.vn/**abc**/manufacture/1-apple.html
http://mydomain.vn/**def**/manufacture/1-apple.html
How can I make sure that user is accessing my correct URLs (with "vn"), all others are redirected to my custom 404 page.
I tried to redirect all the incorrect URLs to 404 page by setting rule in htaccess file but not success.
RewriteEngine On
RewriteBase /
RewriteCond $1 !^(index\.php|images|css|js|txt|png|jpg|gif|flv|swf|resource|publics|uploads|robots)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L,QSA]
***RewriteCond %{REQUEST_URI} !^/vn/ [NC]
RewriteRule ^[^/]+/(.*)$ /vn/$1 [R=301,L,NC,QSA]***
RewriteCond %{HTTP_HOST} ^(.+)\.mydomain\.vn [NC]
RewriteRule ^(.*)$ http://mydomain.vn/$1 [L,R=301]
RewriteCond %{HTTP_HOST} ^www.mydomain.vn/index.php/(.*) [NC]
RewriteRule ^(.*)$ http://mydomain.vn/$1 [L,R=301]

Answer 1

So, it seems like the requirements for your route are:
a fixed list of supported languages; and
the lang value is captured into a request parameter.
So, how about turning the lang route from a Zend_Controller_Router_Route route into Zend_Controller_Router_Route_Regex route with pattern something like:
(\(vn\))
The outer parens are for parameter identification, the standard regex delineation; the inner parens are escaped as part of an (at this moment, trivial) "or" condition.
Then when you add more languages - say 'en' or 'de' or whatever - you could modify the pattern to a less trivial "or" condition:
(\(vn|en|de\))
Not directly tested, just thinking out loud...