Absolutely great! Thank you!

It's absolutely perfect! I can't believe this feature wasn't included in the containers.

Rough UI, and missing an "only if" match option—aka the ability to restrict the selected container to the designated url pattern—to be truly useful.

Exactly what I've been looking for. Being able to specify regex patterns for URIs that should open in a specific container helps with my workflow since I need to perform SSO from other apps as different accounts and there is not way to launch those in the right container without regex.

The UI for managing patterns could use a little love, maybe a title/description box so it's easier to remember what the regex is trying to match against or a GUI that allows pasting a URI and creating the rule right there so you can see if you are matching... but honestly, even without any improvements it fills a gap.

Thanks for putting it out there!