In this case, unless I'm missing something obvious, the private function will have to be something like this, right?

```coffeescript
find_regex = (territory) ->
    for territory_code, regex of PostalCode.postal_codes
    return regex if territory_code == territory
```

From what I understand, the scope of `@postal_codes` will be different. So it'll need to be referred as `PostalCodes.postal_codes`. Is that correct?