php mod_rewrite Permalinks

Question

I am looking for a way to access to:

 http://myurl.com/?file=random_token 

with

 http://myurl.com/random_token/

I already read about mod_rewrite in the .htaccess but I don't know how to setup the pattern.

I tried this:

Options +FollowSymLinks
RewriteEngine on
RewriteRule /(.*)/$ /index.php?file=$1

It would be nice if you can help me.

Answer 1

    RewriteEngine On
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^([^/]*)/$ /?file=$1 [L]