This is an amazing interactive learning tool. Kudos! I vaguely remember from a "computer science modelling" course at uni, learning how to do this process by hand, from the textbook "Introduction To Automata Theory Languages , and Computation". Wish we had had this tool back then.
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Thanks for the kind words. I made it for fun during a compiler course held by professor Christian Schulte at the Royal Institute of Technology here in Sweden.
My original plan was to make similar visualizations for all the different algorithms in Christian's compiler course, but tragically he passed away recently.
Christian is the main designer and developer of many great open source projects, including Unison, Gecode and Mozart. https://chschulte.github.io/software.html
R.I.P. Christian, you were an amazing professor and person. I miss you.
I would like to echo @allanrbo kind words I to think it's a great way to understand regular expressions and their various implementations. I was a little confused about how to change the regex but I'm often confused so it's no reflection on you! I think Christian would have been proud to see what you've done with his ideas.
I feel your loss about Christian, I just realized I have used his software a ton of times. At least you got to meet him!