Well, he seems to not have done any actual exercises. So now that they are actually releasing exercises (have been for some time now), he took a second look and

Well, he seems to not have done any actual exercises. So now that they are actually releasing exercises (have been for some time now), he took a second look and realised he doesn't want to do it.. because the environment does not have library support for regexes? It's such a bizarre reason, because a mini-version of regex in the form of automata is the basis of any compiler. It's about the first exercise in the course, and very simple and fun training for any programmer, really.