Reverse Lookups with JavaScript

I’ve always loved exploring regular expressions because they’re one of those skills that’s never taught in school — you need to pick them up on the fly, messing up and fixing them along the way. Regex’s are incredibly powerful, and one power they have are referred to as backreferences, which essentially allow you to use a match within the same regular expression.

The easiest way to explain a backreference is with a simple goal: using a regex to simulate destructuring. Take the following code snippet:

const body = document.blah.body;

With an awesome new language feature like JavaScript destructuring, a better way to write the code above is:

const { body } = document.

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