Regex based includes/excludes for Zest Recorder

Is your feature request related to a problem? Please describe.
When I'm recording a Zest authentication script for some complex sites, I'm redirected to several authentication servers before finally being sent back to the original site in an authenticated state. A lot of these in between sites are loading .js and .css files that aren't really necessary for the Zest script to have. Being able to exclude these files along with irrelevant tracker requests would save me time from manually deleting them from my Zest script.

Describe the solution you'd like
Right now when recording a Zest script, there is the prefix selection that allows for some URL filtering. I propose that this be replaced with Included/Excluded regex boxes similar to how Context's work.

Start by locating the Zest Recorder implementation and its existing prefix-selection flow. Trace how recorded URLs are filtered, then define the included and excluded regex behavior and verify that authentication redirects, scripts, stylesheets, and tracker requests are handled as intended.