Redirect My old Feed links!

Hi I changed my old Permalink structure from
/2006/01/12/what-ever/ to /what-ever/

with a plugin…and everything is working just fine. But now..my old feeds links are not directing to the new structure, means:
/2006/01/12/what-ever/feed/ is giving me an error
and I want it to be /what-ever/feed/

Note that my .htaccess file in the root directory..and it`s direct to the blog automatically (i.e RewriteRule . /index.php [L])

What should I do, and in which line should I put the new redirecting command(before after RewriteRule . /index.php [L]) ?!!
Thank you