MOD rewrite all URLS after some specific URL folder

I need to redirect all requests with this particular string in their URL address : "http://ift.tt/2dGwSfy" to the new location "subdomain.domain.com" Any ideas how to do that?

I tried : RewriteRule "^http://ift.tt/2e6rpwV" "http://ift.tt/1dTOlMV$1" [R,L=301] but no luck

thank you in advance for any help.