When specifying a string for a web address, allow "contains in domain" as an option.

For example, I have an account with Fidelity. They have multiple domains and subdomains, so I'd like to be able to write a rule that triggers for pages on "fidelity.com" or "www.fidelity.com" or "fidelitynetbenefits.com" to open in the specified browser, but I would not want the rule to trigger for "otherwebsite.com/reviews/fidelity"

I know this can be approximated with regex, but that seems finicky, and I think this issue may occur often enough to be worth having a dedicated option.