Clone or download the repo and open the index.html.
It will require a server. If you have python installed, please run python -m http.server from the root folder of this project (where this README.md is present).
and a lot of other regex tutorials and resources (in addition to the references) I have come across over the years. I will try my best to credit as I trace those back. Please let me know if you should be credited for any section.