Regex on PageSource in JavaScript

Question

I am trying to create basic extension that finds a simple code that is often referenced in different pages in source (inside script tags, inside html classes etc).

Is there a way to run regex over the source code of a page inside?

Specicially, I have tried the following without success:

var code = document.innerHtml.match(/(b|cd)ef/)[0]

Answer 1

Here is something you can do

const matchingCode = /.*croiss.*\s*/.exec(document.querySelector('#code').innerText, 'gmi');

console.log(matchingCode);

<div id="code">
  <div>
    J'aime les croissants
  </div>

  <div>
    Moi j'aime les endives
  </div>
</div>