Apache 2.2 mod_rewrite question

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The discussion revolves around the proper syntax for using Apache's mod_rewrite to check for a substring in a cookie based on the request URI. The user initially attempted to create a rewrite condition using a combination of the HTTP_COOKIE and REQUEST_URI variables but faced issues with syntax. They discovered that the problem was related to local backreferences, which are only supported on POSIX 1003.2+ compliant operating systems. The user found that using \N for backreferences worked, while the bind name /N$ did not. This insight aims to help others avoid similar pitfalls in their mod_rewrite configurations.
Paolo Cera
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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

Code: 
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.
 
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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.
 

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