How to redirect all Subdirectory requests to the Subdomain using .htaccess?

Question

I've been trying to redirect all Subdirectory requests to a Subdomain, so all the requests made to:

 domain.com/q2a  or  domain.com/q2a/2/ 
gets redirected to:
 q2a.domain.com  and  q2a.domain.com/2/ 

So I'm using this:

RedirectMatch 301 ^/q2a/(.*)$ http://q2a.domain.com/$1

This works well when redirecting to the Subdomain. The thing is after I being redirected the link looks something like this:

 q2a.domain.com/2?qa-rewrite=2

Am I not doing this the right way? Should I be doing this in other way?

Comments

Did you come up with a solution to this issue?