How to make 301 redirect from index.pl url?

Question

htaccess

How to make a 301 redirect from a page like: site.net/index.pl?act=CONTACTS to a page like site.net/contact,
this one doesn't work:
RewriteCond %{QUERY_STRING} ^act=CONTACTS
RewriteRule ^.*$ /contact? [R=301,L]
The point here is index.pl , if index.php it would be normal. Help!