can not find the "right" redirect code for .htaccess

For an unknown reason Google is generating url extentions on rich snippet pages.
the most common one that I get it domain.com/?SD
I would like to get rid of ?SD and redirect to domain.com or / is enough
Now, I am unable to redirect using htaccess %{QUERY_STRING} , and a few other syntaxes did not work.
Can any one help ?

 

Try using something like this:

RewriteEngine On
RewriteBase /
RewriteCond %{QUERY_STRING} ^SD [NC]
RewriteRule ^(.*)$ /$1? [R=301,L]

Code (markup):

That should fix your problem(s).
Cheers!

 

Hey man.. That worked like a charm.. 3 weeks of research = 1 question @digitalpoint ...
Thanks a million.. +1