using %{REFERER} in htaccess

I am trying to do a

Redirect permanent /index.php http://www.something.com/test/index.php

it works fine, but i want to replace http://www.something.com with %{HTTP_REFERER} so it can change where to go based on where they came from.

any ideas?

Alex

I'm not sure what you're trying to do, replacing http://www.something.com with
%{HTTP_REFERER} doesn't seem a good idea to me, personally, are you sure you want to do that?

This code should get you started anyway, (if you have mod_rewrite on your server and enabled):
RewriteEngine On

# if %{HTTP_REFERER} isn't empty
RewriteCond %{HTTP_REFERER} !^$
# redirect some where based on it
RewriteRule ^index\.php$ %{HTTP_REFERER}/test/index.php [R,L]

# if %{HTTP_REFERER} was empty go to this default page
RewriteRule ^index\.php$ http://default.tld/page.ext [R,L]
index\.php is the page to redirect if accessed. ("." [periods] are escaped with "\" [backslash])
http://default.tld/page.ext is the default page to redirect to.
%{HTTP_REFERER}/test/index.php is the place to redirect to based on the referer.