Hide raw regular expression from $_SERVER['server_name']

[justin]

I am using a regular expression in a server_name:

         server_name ~^(?!web2\.)(?<account>.+)\.mydomain\.com$;

In PHP, or any language for that matter, if I:

        echo $_SERVER['server_name'];
        //~^(?!web2\.)(?.+)\.mydomain\.com$

I get the raw regular expression back. Is it possible to mask this, and
instead return the actual regular expression matchedaccount? I.E.
foo.mydomain.com.

Posted at Nginx Forum: 
http://forum.nginx.org/read.php?2,241519,241519#msg-241519

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