Get all properly formatted urls from a text by combining NSDataDetector vs NSRegularExpression

UrlDetection.swift

struct Regex {

  static let urlRegex: NSRegularExpression? = {
    do {
      return try NSRegularExpression(pattern: "(http(s)?:\\/\\/)?(www\\.)?[-a-zA-Z0-9\\@:%_\\+~#=]{2,256}\\.[a-z]{2,6}\\b([-a-zA-Z0-9\\@:%_\\+.~#?&//=]*)", options: .caseInsensitive)
    } catch {
      return nil
    }
  }()

  static let urlDetector: NSDataDetector? = {
    do {
      return try NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
    } catch let err {
      print(err)
      return nil
    }
  }()
}

@discardableResult static func regexUrl(text: String) -> [NSRange] {
  let textLength = (text as NSString).length
  var matches = [NSRange]()
  /// Firstly, detecting all matches by NSDataDetector that will detect maybe properly formmated urls the most
  Regex.urlDetector?.matches(in: text, options: [], range: NSRange(location: 0, length: textLength)).forEach({ (res) in
    let sub = (text as NSString).substring(with: res.range)
    let components = sub.components(separatedBy: ".")
    /// Exceed this improperly url (www.google)                                                                                                     
    if let urlPrefix = components.first?.lowercased(), (urlPrefix.contains("www") || urlPrefix[urlPrefix.index(urlPrefix.endIndex, offsetBy: -1)] == "/") && components.count < 3 {
      print("ignored: ", sub)
    } else if validateUrl(url: sub) {
      /// Additional, there are some improperly urls that is acceptable by NSDataDetector, so we need to re-validate with NSRegularExpression
      /// to ensure that it's actually properly.
      matches.append(res.range)
      print(sub)
    }
  })
  return matches
}
static func validateUrl(url: String) -> Bool {
  if let regex = Regex.urlRegex {
    return regex.firstMatch(in: url, options: [], range: NSRange(location: 0, length: (url as NSString).length)) != nil
  }
  return false
}