phranque - 10:57 pm on Apr 4, 2013 (gmt 0)
i think you really want an internal rewrite rather than a redirect.
this means you will need mod_rewrite rather than mod_alias and you'll want to use the RewriteRule Directive:
check out the RegEx documentation in the Apache mod_rewrite Introduction:
it should be very informative for your specific requirements.
then give it a try and report back.