swift credit card validate
enum CardType: String {
case Unknown, Amex, Visa, MasterCard, Diners, Discover, JCB, Elo, Hipercard, UnionPay
static let allCards = [Amex, Visa, MasterCard, Diners, Discover, JCB, Elo, Hipercard, UnionPay]
var regex : String {
switch self {
case .Amex:
return "^3[47][0-9]{5,}$"
case .Visa:
return "^4[0-9]{6,}([0-9]{3})?$"
case .MasterCard:
return "^(5[1-5][0-9]{4}|677189)[0-9]{5,}$"
case .Diners:
return "^3(?:0[0-5]|[68][0-9])[0-9]{4,}$"
case .Discover:
return "^6(?:011|5[0-9]{2})[0-9]{3,}$"
case .JCB:
return "^(?:2131|1800|35[0-9]{3})[0-9]{3,}$"
case .UnionPay:
return "^(62|88)[0-9]{5,}$"
case .Hipercard:
return "^(606282|3841)[0-9]{5,}$"
case .Elo:
return "^((((636368)|(438935)|(504175)|(451416)|(636297))[0-9]{0,10})|((5067)|(4576)|(4011))[0-9]{0,12})$"
default:
return ""
}
}
}
extension UITextField{
func validateCreditCardFormat()-> (type: CardType, valid: Bool) {
// Get only numbers from the input string
var input = self.text!
let numberOnly = input.stringByReplacingOccurrencesOfString("[^0-9]", withString: "", options: .RegularExpressionSearch)
var type: CardType = .Unknown
var formatted = ""
var valid = false
// detect card type
for card in CardType.allCards {
if (matchesRegex(card.regex, text: numberOnly)) {
type = card
break
}
}
// check validity
valid = luhnCheck(numberOnly)
// format
var formatted4 = ""
for character in numberOnly.characters {
if formatted4.characters.count == 4 {
formatted += formatted4 + " "
formatted4 = ""
}
formatted4.append(character)
}
formatted += formatted4 // the rest
// return the tuple
return (type, valid)
}
func matchesRegex(regex: String!, text: String!) -> Bool {
do {
let regex = try NSRegularExpression(pattern: regex, options: [.CaseInsensitive])
let nsString = text as NSString
let match = regex.firstMatchInString(text, options: [], range: NSMakeRange(0, nsString.length))
return (match != nil)
} catch {
return false
}
}
func luhnCheck(number: String) -> Bool {
var sum = 0
let digitStrings = number.characters.reverse().map { String($0) }
for tuple in digitStrings.enumerate() {
guard let digit = Int(tuple.element) else { return false }
let odd = tuple.index % 2 == 1
switch (odd, digit) {
case (true, 9):
sum += 9
case (true, 0...8):
sum += (digit * 2) % 9
default:
sum += digit
}
}
return sum % 10 == 0
}
}