And https://www.debuggex.com/ https://www.debuggex.com/ for visualizing regex as railroad diagrams. I'd agree that we get used to regex with usage, but need to

And https://www.debuggex.com/ https://www.debuggex.com/ for visualizing regex as railroad diagrams. I'd agree that we get used to regex with usage, but need to be extra careful to test all the corner cases (since by design, a pattern matches multiple things).