Regular Expressions project

What project can I make to test my skills in the Regular Expressions?
As I want to make sure that I am on the right path.

I think the site bellow might help you with that. If you need some help thinking up a few challenges to do;

Thank you very much for your help. I really appreciate it!

if you want, the project about convalidating phone numbers can be solved with regexp
that would be a great challenge for you