Redirect all pages to one page?

I was hoping that someone out there could help me with this. I would like to redirect every post and page on my site to one specific page on my site (For example: http://www.mydomain.com/redirection-page). This page will have a message indicating that the site has moved and a link to the new site & domain.

I am pretty sure this can be done with regular expressions, but I don’t have much experience with them. I put in a wildcard expression, but I get stuck in a redirection loop, since the one page I want them to get to is included in that wildcard.

So how would I go about redirecting all of the pages, except for the one page I want them to end up on?

I know how I could just forward everything over to the new site directly, but I would prefer if everyone landed at an explanation page on the old site first instead of abruptly ending up an an unexpected domain.

Thanks for any assistance.

http://wordpress.org/extend/plugins/redirection/