What time is it isn’t an invalid question. “How do I make my hamster grow wings and fly?” is. How to parse HTML with a RegEx is an in-between. For a specialized

What time is it isn’t an invalid question. “How do I make my hamster grow wings and fly?” is. How to parse HTML with a RegEx is an in-between. For a specialized case, why not? Answer that question, then provide a counter example to show how it will be very fragile, then explain the theory, then show a better way. IME that tends to work better to teach someone what you think they should know.