attrs filtering - regex pattern matching

I'd like our radius proxy server to allow an A/V pair, but, cannot find any examples where I can apply any regex type rules to allow a range of values. For example, I received the following from a remote radius server : Cisco-AVPair = vpdn:ip-addresses=10.10.1.4 and would want to (using attrs) allow anything that matches: Cisco-AVPair = vpdn:ip-addresses=.* Where ".*" would be anything following the "=" How might I allow this using attrs? I'm running freeradius 1.0.5 I can't upgrade to 2.x yet, so I'm looking for suggestions/feedback for 1.x