surrealillusions - 10:13 am on Sep 28, 2012 (gmt 0)
Is your dummy subdomain located in a subdirectory inside the real domain?
Yes. The .htaccess with only this rewrite rule sits inside that subdirectory.
I still don't get why its not working though. Should that rule work the way I've got it or not? What do I need to write to make it work?
The pattern for the rule can match only the path part of the requested URL, not hostname nor query string.
I dont understand what you mean by this?