7 Practice with Regular Expressions
Please refer to the following websites for some practice with creating Regular Expressions (regex). Solutions are available online if you get stuck.
The following website has a tutorial and practice problems as you work through the tutorial: https://regexone.com/ ( also see: https://umar-yusuf.blogspot.com/2021/03/regexonecom-alternative-solution.html )
The following is another website with a short tutorial and practice problems: http://regextutorials.com/
The following website encourages you to practice regex concepts through puzzles that are very similar to typical “crossword” puzzles. Make sure to read “how to play”. There is a website and an app for your phone. They are both good (the phone app is much easier for using on a phone than the website): https://regexcrossword.com/