I wanted to follow [this tutorial](https://www.raywenderlich.com/86205/nsregularexpression-swift-tutorial) to learn about `NSRegularExpression` in `Swift`, but it has not been updated to `Swift 3`. When I open the playground with the examples they provide, I get several errors being one of them the call:

```
let regex = NSRegularExpression(pattern: pattern, options: .allZeros, error: nil)

```

I've seen that now that initializer throws an exception so I changed the call, but that `.allZeros` does not seem to exist anymore. I don't find any tutorial or example with an equivalent of that in `Swift 3`, could somebody tell me what option should now replace such `.allZeros` option?