PHP .htaccess Using Variables as folders/files?

So I have a solution to my initial issue, however I don't think this is very efficient or secure.

In short, I want to redirect users who type example.com/[random 9 Alpha-Numeric code] to http://ift.tt/2wCQU0v while still using their entered url.

And I want to redirect example.com/[random 4 Alpha-Numeric code] to http://ift.tt/2xi9gYf

My .htaccess file contains:

RewriteEngine on 
RewriteRule ^(\w+)$ ./claim.php?code=$1

I have thought about redirecting all codes to a single php file and then choosing where to go, but I feel there is a better way.

I am not looking for someone to write me anything, I just some need someone to direct me towards an answer with what I need to look up.