We can add a check here, either ternary or with an if, to check to see if `thread` matches the thing regex.
```js
return superagent.get(base_url + 'comments/' + (thread.match(thing.regex) ? thread.split('_')[1] : thread) + '.json');
```
Also, side note, wrapping a variable in a methods doc with square brackets means the argument is optional ;)