Routing URLs and trailing slashes

The problem is that I need urls like that mypage.html and mycategorie/, I need both.

So look my my complete routes.php

PHP Code:

$route['default_controller'] = "site";
$route['404_override'] = 'site/error_404';
$route['contact.html'] = "site/contact";
$route['buy-([0-9a-zA-Z-_+]+).html'] = "site/buy/$1";
$route['([0-9a-zA-Z-_+]+)/([0-9a-zA-Z-_+]+).html'] = "site/article/$1/$2";
$route['([0-9a-zA-Z-_+]+).html'] = "site/page/$1";
$route['([0-9a-zA-Z-_+]+)'] = "site/categorie/$1"; // for my pages like that categorie/ 


Code:

RewriteCond %{REQUEST_FILENAME} !-f
#RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/?$ index.php?/$1/ [L]

Changing my htaccess doesn't change nothing

I still have the same probleme, I can access to my page : http://site.com/categorie/ and http://site.com/categorie
There is any redirection.

I don't like my last roule :

PHP Code:

$route['([0-9a-zA-Z-_+]+)'] = "site/categorie/$1"; // for my pages like that categorie/ 


But I see any other solution to make my categories like that categorie1/, categorie2/