I've now added regex filtering, how it works and how to use it is included in the README. See default config for the correct setting.
I've also updated the selected_collections information on how it works, and exposed a new setting to control how long before a collection can be re-pinned (in hours) after its been selected for the first time!
Please see the updated config for changes.
What's Changed
Full Changelog: ColleXions1.16b...ColleXions1.20