[goto11]

OK but these are two separate question.

Of course you should use an existing library if it solves the exact problem you have. Don't waste time re-implementing the wheel unless you are doing if for educational purposes. Whether such a library used regexes or not under the hood would be irrelevant as long as it works and it well tested.

But I would certainly like to hear an argument why you think a regex is less robust that a similar manual character-by-character matcher.