extension String {
  func word(at index: Int) -> String {
    do {
      let regex = try NSRegularExpression(pattern: "([A-Z]|[a-z]|[0-9])\\w+", options: .caseInsensitive)

      let matches = regex.matches(in: self, options: .reportCompletion, range: NSRange(location: 0, length: self.count)).map { regexMatch -> Substring in
        let range = regexMatch.range
        return self[self.index(self.startIndex, offsetBy: range.location)..<self.index(self.startIndex, offsetBy: range.location + range.length)]
      }

      guard matches.count > index else {
        return ""
      }

      return String(matches[index])
    } catch let error {
      return ""
    }
  }
}