Using .htaccess to redirect to CDN

I am currently trying to redirect all the .css and .js files in my wordpress to my CDN. I was using W3TC to perform this CDN operation but I realised that an authenticated user using the Wordpress Dashboard does not load their .css and .js files from the CDN. The problem lies with the WP-Admin files not being put on the CDN/accessed and I am not sure how to fix that. Hence, I thought of using .htaccess to perform this redirect to my CDN. Currently, I am trying this but it does not seem to be working...

<IfModule mod_rewrite.c>  
        RewriteEngine On  
        RewriteCond %{HTTP_HOST} ^(www\.)?example.com  
        RewriteCond %{REQUEST_URI} ^(.*)\.js$  
        RewriteRule ^/(.*)$ https://cdn.example.com/$1   
  [NC,NE,R=301]
  </IfModule>