RegexOne - Learn Regular Expressions -- will get you thru the basics (i.e., more than most people know) with interactive practice which is probably the best way. HTB probably does the hands on approach, too. Anyhow, RegexOne makes it about as clear as it gets, and keep practicing until is sinks in is my advice. Source: 6 months ago

I spent 30 minutes learning regex from https://regexone.com/ years ago. The attitude of "I don't need to learn is baffling. Source: about 1 year ago

Https://regexone.com/ is a fantastic resource for learning the foundations of Regex. Source: about 1 year ago

Hi guys, can anyone recommend some online resources where I can find regex tasks (and hopefully guidelines how to solve them/solutions)? What I did so far: - went through all of the problems on regexone https://regexone.com/ - covered Ryan's tutorial on regex (will probably go through it again) - currently covering regexlearn.com/learn/regex10 Everyone seems to reccomend https://regexr.com/ but I don't think I... Source: about 1 year ago

Just do https://regexone.com/ once and you will become much better at it. It takes less than an hour! Source: about 1 year ago

I also tried this one https://chrome.google.com/webstore/detail/infinity-new-tab-producti/dbfmnekepjoapopniengjbcpnbljalfg, last update Nov 2020. It didn't do anything either and 'Options' menu is greyed out :(. Source: about 3 years ago