That's bullshit. By explaining to them Chomsky Hierarchies they can understand limitations of regexes and learn about parsers and. By showing them the regex a

That's bullshit. By explaining to them Chomsky Hierarchies they can understand limitations of regexes and learn about parsers and. By showing them the regex able to parse a limited HTML subset they might be able to try it out and see such limitations by themselves on their own screen. Additionally they might be able to learn some new regex tricks. Maybe you learned things in a different way, but lots of people enjoy learning stuff by doing and by seeing demonstrations.