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Reminds me of websites like https://www.sqlteaching.com/ It's obviously not for regexes but after that I understood basic SQL so much better.

(also I love comments that point out amazing learning resources with full conviction)

The creator of regexone.com also created sqlbolt.com for SQL, which I also highly recommend.

I haven't seen it mentioned here yet, but wanted to throw out (https://regexr.com/) as a decent resource into writing regular expressions. I think I haven't needed to use a tutorial because of how easy it makes writing them.

I'll second this, it's immensely useful when I can't wrap my head around a regular expression.

regex101.com is my go-to, because it supports regex flags and Python regexes.

Going to add regexper.com which is really good for explaining RegEx patterns.

Strongly agree with this recommendation. I ran through regexone.com once, and even though I already knew regexes, it helped me fill in some stuff I had gotten rusty on.

I highly recommend the lessons. If you do them, I also highly recommend donating the recommended $4 via Paypal (or more), although it's technically free to use. It's well worth it.