Huntgroup and regular expression

I am running a fairly old version of FreeRADIUS (1.0.1). I would like to define a regular expression (such as Guest\d+) for a set of users in the huntgroup file for a specific NAS. Based on my reading of the docs, this does not look like it is possible/supported, but I wanted to check with the experts on the list in case I over had looked something obvious. Thanks for your time and wisdom. --Bill