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If you don't know regex--how to write them, how to use them, what they're good for, what they're not good for--what makes you think you're competent to review a PR containing one?

If you don't know how to regex and you let your imaginary LLM friend write one for you, and you foist that upon your colleagues for review, you've just abused their trust. Because they, being ethical, honest engineers, must now do all the work you neglected except they're doing it at review time instead of at the time of writing.

Or maybe they're dishonest and unethical and they'll just maliciously or negligently approve the PR without actually reviewing the regex.

Either way the situation is completely rotten. You can never ethically use an LLM to do something you're not competent to do yourself.