Url Rewrite get some string on Web config

I want to get some string on web config.

For example, Entered link by the user: http://ift.tt/eIlFV0abc/def/ghi/jkl

Will redirect link: http://www.google.com/abc/def/ghi/jkl

So, I need "abc/def/ghi/jkl".

Thank you.