ProxyPassMatch with ProxyPassReverse

Folks, We are trying to setup Apache reverse proxy for the following scenario:

• Incoming requests take the form http://foo.com/APP/v1/main.html
• For some servers the URL will reference a difference version, say, http://foo.com/APP/v2/main.html
• An upstream load balancer (HAProxy) will send the request to the right server which will have an Apache2 reverse proxy fronting a JBoss server.
• When the request shows up at Apache 2 it will have request path like /APP/v1/main.html
• We want it to (reverse) proxy out to http://localhost:8080/AppContext/main.html, irrespective of version fragment in URL (v1, v2, etc.).

I have been trying to do this like so:

ProxyPassMatch ^/.*?/APP.*?/(.*)$ http://localhost:8080/AppContext/$1
ProxyPassReverse /APP http://localhost:8080/AppContext

My questions are:

1. Is my use of ProxyPassMatch correct?
2. My ProxyPassReverse is "static". How do I make it aware of the potentially variable stuff after /APP?

Thanks for any insights.

-Raj