Email & Phone Validation in Swift

Question

i am using the following code for phone number validation. But i am getting the following error. I cant able to proceed further. Help us to take it forward.

Answer 1

Swift 3:

private func validate(phoneNumber: String) -> Bool {
    let charcterSet  = NSCharacterSet(charactersIn: "+0123456789").inverted
    let inputString = phoneNumber.components(separatedBy: charcterSet)
    let filtered = inputString.joined(separator: "")
    return  phoneNumber == filtered
}