using Regular expressions with redirection plugin

OK, I still am looking for help with this regular expressions stuff! I tried to set up a regular expressions with a code sample posted on the plugin page, but cannot get it to work. Has any had success with using Regular expressions with the redirection plugin? Would you be willing to help others that cannot seem to figure this out? HELP!

Here is the regular expression code I tried: /blog​/(.*) => ​/$1

I had a blog set up like this: http://domainname.com/blog/
and not is it set up like this: http://domainname.com/

So what regular expression code do I need for this?