Are questions regarding
mod_rewrite better asked on Webmasters SE or Server Fault?
Webmaster isn't really for code and programming related issues, though it depends how complex the rewrite question is.
What's your job title? If it is "programmer", ask on Stack Overflow. If it is "sysadmin", ask on Server Fault. If it's neither of the two, you can try webmasters.
You could also ask this very meta question on meta.webmasters for that matter.. see