Question

I’m trying to add support into showdown.js for code fencing, but I’m still sort of a noob at regex. Code fencing, if you don’t know, is like this:

```javascript
alert('hello world');
```

Then it’d create something like:

<div class="highlight">
  <pre lang="javascript">
    alert('hello world');
  </pre>
</div>

How do I go about capturing “`(anything)\n(anything)“` in JavaScript flavored regex?

Answer 1

r = /`{3}(?:(.*$)\n)?([\s\S]*)`{3}/m;
r.exec(yourSampleString); // => [..., "javascript", "alert('hello world');\n"]
r.exec('```puts "ok"```'); // => [..., undefined, "puts \"ok\""]
r.exec('```foo```bar```'); // => [..., undefined, "foo```bar"]