Is there a way to use regular expressions when setting a value in a rewrite rule?

Something like:

rewrite r_rewrite_set_host{

  subst("^[a-z]+\-([a-z]+).*$", "$1", value("HOST"));

  set("HOST" value("location")

    condition(

      filter(f_filter_hostnames)

    )

  );

};

But without changing the actual log message.  The goal is to create a variable from a regular expression of the host field in the message that I can then use in a destination path.

Thanks,

-Mark

Mark Faine

System Administrator

SAIC/NICS

215 Wynn Dr. 5065

Huntsville, AL 35805

256-961-1295 (Desk)

256-617-4861 (Work Cell)