I have a caching system I need to bypass if the user's name (in a cookie) is found in the $request_uri. I'm trying to do something like this, but can't get the variable to interpolate into the regex. Any suggestions pretty please?

I can set the $me variable just fine from the cookie; I just can't get it to interpolate into the regex.

set $chk == "need"; 
set $me "kevin"; 
if ($uri ~ $me) { set $chk ""; } 
if ($chk == "need") { rewrite ^ /testing }

I've always tried things like this:

if ($uri ~ "by-{$me}") { set $chk ""; }

Thanks! -Kevin

regex nginx
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