Feature request: shared helper for "regex → matching net interfaces"

Feature request: shared helper for "regex → matching net interfaces": a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). We've now got multiple commands that all want the same thing: take a regular expression (POSIX) from the user, look at the system's netlink links…

The task

We've now got multiple commands that all want the same thing: take a regular expression (POSIX) from the user, look at the system's netlink links, and operate on the subset whose names match.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.