Comment by StilesCrisis

3 hours ago

Why? Unless it's an extraordinarily hot code path, it doesn't matter. A regex once compiled will be quite efficient.

It's simple, unless you're given a specific broader context (like we have an enterprise customer data pruning system that needs to handle a broad range of corner cases) then you must not resort to overengineering this early in an interview.

And an extra import. also, it sounds like they where looking specifically for knowledge of built-in operators.