This is a tutorial about writing a broughlike (a small roguelike game similar to 868-HACK or Cinco Paus) from scratch in JavaScript.

In this book, you won’t just see how to use regex in a regex testing tool like regexpal or regex101. You’ll also see how they works in JavaScript. This is what many courses and tutorials tailored for regex in JavaScript lack. As you see how they work using a regex tester, you’ll also see how they work in JavaScript.