How would I redirect all files and folders to index with the exception of only a hand full?

Right now I have this, which is redirecting everything, included needed files such as css and js files for site functionality.

```
RewriteEngine on
RewriteCond %{HTTP_HOST} mysite.com
RewriteCond %{REQUEST_URI} !^/index.php
RewriteRule ^(.*)$ /index.php [L,R=301]
```