Regex Practice

Fourteen short, hands-on regex lessons, from your first .test() call to lookahead, backreferences, and capstones that pull real data out of messy text. Each lesson gives you a task and a Run button - your code is checked against real tests the moment you run it. Everything runs in your browser.

Already read Regular Expressions, Explained? This is where that theory turns into muscle memory. Start with lesson 1 - you can leave and come back any time, your code is saved locally.