Apache 2.2 mod_rewrite question

[Paolo Cera]

Anyone know of the proper syntax that captures this metaphor?

Given a Cookie and URI, I would like to check for the existence of a substring in the cookie in the URI and then proceed to a rewrite rule accordingly.

Here's an example of my reasoning

RewriteEngine on

...


RewriteCond %{HTTP_COOKIE},%{REQUEST_URI} .*xXx(.+)xXx.*,.*$1.*
RewriteRule blah,blah,blah

I would suspect something likes this is syntactically correct, but repeated testing proves me wrong. Any help would be appreciated.

 

[Paolo Cera]

Got the answer to this. Turns out that I'm trying to do something called a local backreference, and the solution is only portable to POSIX 1003.2+ compliant OSes. More on it can be found here.

Note, the bind name /N$ (where 0 < N < 9) did not work for me, but \N did.

Anyways, hope this doesn't trip up anyone else in the future.