[TruthSHIFT]

I'm not a RegEx expert, but I've googled them enough to have the basics. This is exactly what I needed to improve my skills.

[SemiNormal]

https://regexr.com/ is another good site for testing your RegEx.

[asicsp]

For more such sites: https://news.ycombinator.com/item?id=20614847

See also: https://github.com/aloisdg/awesome-regex

[acomjean]

I like the way regexr highlights the regex matching, display with nested boxes.