[CentOS] .htaccess and ?

Hi,

I'm trying to write .htaccess Rewrite rules and it doesn't seem to
work for me:

Match the string between the domain and the question mark: ?

http://www.abc.com/blog:long-name-of-page?action=diff and I want to
redirect it to: http://www.abc.com/blog:long-name-of-page

Any suggestion?

Thanks