This type of useless comment is why I tend to avoid HN for periods at a time. Congrats, you've shown the world you know what "isomorphic" and "FSA" means, but did you initially bring anything constructive? No. You had to edit in things barely constructive because your impulse was to tear down rather than build up.

> Neither beautiful nor a visualization really.

This is the least helpful thing I can imagine. "Here's a beautiful regex visualizier" "LOL NO IT'S NOT". Geez.