I’m a little late on this story but Hazel got a very nice update over the last few months. The new version 4.1 adds several useful features including:

Better date matching
The ability to make a match based on file attributes of another file in the same folder
There's also a new token for "any non-blank character"

These and other additions make this a nice improvement to an already useful Mac utility. I'm working on some new video content based on the updates. It will get added to the Hazel Video Field Guide when it's finished. I’m not making any promises on a release date just yet.