.htaccess problem...please provide some hints.

[Lubos Rendek <lubosrendek@gmail.com>]

Hi guys,

I'm unable to get the right redirection using .htaccess file. What I
have is this

URL http://example.com/?lang=ar&;
or
http://example.com/?lang=ar&registration

and I would like this to be redirected to http://example.com/ .

In fact I would like to have all URL's which contain "lang=" to be
redirected to http://example.com .

any hints?

thank you

lubos