How to exclude certain file types from the following htaccess rewrite rule?

Question

How can you exclude certain file types (xml and txt) from the following rewrite rule?

RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_URI} !(.*)/$ RewriteRule ^(.*)$ http://website.com/$1/ [QSA,L,R=301] 

Answer 1

What about:

 RewriteCond %{REQUEST_URI} !\.(xml|txt)$