在你将其标记为在另一篇文章中回答之前（我已经看过了）。但是在他们中没有一个他们明确地说他们建议用于C＃的REGEX（我认为他们更关注Javascript）。现在我对正则表达式不太好，但我很感激任何帮助确定如何获得类型，一旦我得到正则表达式，我如何验证针对正则表达式输入的cc？
我在StackOverflow中的许多帖子中都看到了这个答案，但如果是的话，我会在C＃中使用相同的代码吗？如何将我的creditCard字符串与正则表达式进行比较？
我真的很感激任何帮助，这是我第一次处理信用卡验证，只需要获得类型。根据需要的人的反馈，下拉是不可能的。
答案 0 :(得分：5)
该页面上的任何正则表达式都适用于C＃。例如：
string isVisa = "^4[0-9]{12}(?:[0-9]{3})?$";
string ccnumber = "1234123412341234";
if (System.Text.RegularExpressions.Regex.IsMatch(ccnumber, isVisa)) {
// valid Visa card
}
我总是建议在C＃中测试正则表达式的程序是Expresso。您将能够测试该计划中的任何信用卡号验证模式。
答案 1 :(得分：2)
这是下一个家伙的完整答案。
public enum CardType
{
MasterCard, Visa, AmericanExpress, Discover, JCB
};
public static CardType FindType(string cardNumber)
{
//https://www.regular-expressions.info/creditcard.html
if (Regex.Match(cardNumber, @"^4[0-9]{12}(?:[0-9]{3})?$").Success)
{
return CardType.Visa;
}
if (Regex.Match(cardNumber, @"^(?:5[1-5][0-9]{2}|222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$").Success)
{
return CardType.MasterCard;
}
if (Regex.Match(cardNumber, @"^3[47][0-9]{13}$").Success)
{
return CardType.AmericanExpress;
}
if (Regex.Match(cardNumber, @"^6(?:011|5[0-9]{2})[0-9]{12}$").Success)
{
return CardType.Discover;
}
if (Regex.Match(cardNumber, @"^(?:2131|1800|35\d{3})\d{11}$").Success)
{
return CardType.JCB;
}
throw new Exception("Unknown card.");
}
//test validation
//https://clevercreditcards.com
Validate("4169773331987017");//visa
Validate("4658958254583145");//visa
Validate("4771320594033780");//visa
Validate("5410710000901089");//mc
Validate("5289675573349651");//mc
Validate("5582128534772839");//mc
Validate("349101032764066");//ae
Validate("343042534582349");//ae
Validate("371305972529535");//ae
Validate("6011683204539909");//discover
Validate("6011488563514596");//discover
Validate("6011465836488204");//discover
Validate("3529908921371639");//jcb
Validate("3589295535870728");//jcb
Validate("3569239206830557");//jcb
答案 2 :(得分：0)
这是对前一个人的更全面的回答。
public string CC_NUM { get; set; }
/// <summary>
/// getCardType()
/// </summary>
/// <returns>Matches a object reference to regex to bring back a card type, the validity of the card, or a default (Unknown)</returns>
public CreditCardType getCardType()
{
return new Regex(@"^4[0-9]{6,}$").IsMatch(CC_NUM) ? CreditCardType.Visa :
new Regex(@"^5[1-5][0-9]{5,}|222[1-9][0-9]{3,}|22[3-9][0-9]{4,}|2[3-6][0-9]{5,}|27[01][0-9]{4,}|2720[0-9]{3,}$").IsMatch(CC_NUM) ? CreditCardType.MasterCard :
new Regex(@"^3[47][0-9]{5,}$").IsMatch(CC_NUM) ? CreditCardType.AmericanExpress :
new Regex(@"^65[4-9][0-9]{13}|64[4-9][0-9]{13}|6011[0-9]{12}|(622(?:12[6-9]|1[3-9][0-9]|[2-8][0-9][0-9]|9[01][0-9]|92[0-5])[0-9]{10})$").IsMatch(CC_NUM) ? CreditCardType.Discover :
new Regex(@"^3[47][0-9]{13}$").IsMatch(CC_NUM) ? CreditCardType.Amex :
new Regex(@"^(6541|6556)[0-9]{12}$").IsMatch(CC_NUM) ? CreditCardType.BCGlobal :
new Regex(@"^389[0-9]{11}$").IsMatch(CC_NUM) ? CreditCardType.CarteBlanch :
new Regex(@"^3(?:0[0-5]|[68][0-9])[0-9]{11}$").IsMatch(CC_NUM) ? CreditCardType.DinersClub :
new Regex(@"^63[7-9][0-9]{13}$").IsMatch(CC_NUM) ? CreditCardType.InstaPaymentCard :
new Regex(@"^(?:2131|1800|35\d{3})\d{11}$").IsMatch(CC_NUM) ? CreditCardType.JCBCard :
new Regex(@"^9[0-9]{15}$").IsMatch(CC_NUM) ? CreditCardType.KoreanLocal :
new Regex(@"^(6304|6706|6709|6771)[0-9]{12,15}$").IsMatch(CC_NUM) ? CreditCardType.LaserCard :
new Regex(@"^(5018|5020|5038|6304|6759|6761|6763)[0-9]{8,15}$").IsMatch(CC_NUM) ? CreditCardType.Maestro :
new Regex(@"^(6334|6767)[0-9]{12}|(6334|6767)[0-9]{14}|(6334|6767)[0-9]{15}$").IsMatch(CC_NUM) ? CreditCardType.Solo :
new Regex(@"^(4903|4905|4911|4936|6333|6759)[0-9]{12}|(4903|4905|4911|4936|6333|6759)[0-9]{14}|(4903|4905|4911|4936|6333|6759)[0-9]{15}|564182[0-9]{10}|564182[0-9]{12}|564182[0-9]{13}|633110[0-9]{10}|633110[0-9]{12}|633110[0-9]{13}$").IsMatch(CC_NUM) ? CreditCardType.SwitchCard :
new Regex(@"^(62[0-9]{14,17})$").IsMatch(CC_NUM) ? CreditCardType.UnionPay :
CC_NUM.Where((e) => e >= '0' && e <= '9').Reverse().Select((e, i) => ((int)e - 48) * (i % 2 == 0 ? 1 : 2)).Sum((e) => e / 10 + e % 10) == 0 ? CreditCardType.NotFormatted :
CreditCardType.Unknown;
}
/// <summary>
/// isCreditCardAccepted()
/// </summary>
/// <returns>Checks to see if the credit card is allowed by comparing it to the integer value of CreditCardType to a local array of allowed integers</returns>
public bool isCreditCardAccepted()
{
// This should honestly be internalized somewhere for security reasons
int[] allowed = new int[] { 0, 1, 2, 3 };
return Array.IndexOf(allowed, getCardType()) >= 0;
}
public enum CreditCardType
{
Visa = 0,
MasterCard = 1,
AmericanExpress = 2,
Discover = 3,
Amex = 4,
BCGlobal = 5,
CarteBlanch = 6,
DinersClub = 7,
InstaPaymentCard = 8,
JCBCard = 9,
KoreanLocal = 10,
LaserCard = 11,
Maestro = 12,
Solo = 13,
SwitchCard = 14,
UnionPay = 15,
NotFormatted = 16,
Unknown = 17
}
答案 3 :(得分：0)
使用 this 正则表达式更新版本
public static CreditCardType GetCreditCardType(string CreditCardNumber)
{
Regex regAmex = new Regex("^3[47][0-9]{13}$");
Regex regBCGlobal = new Regex("^(6541|6556)[0-9]{12}$");
Regex regCarteBlanche = new Regex("^389[0-9]{11}$");
Regex regDinersClub = new Regex("^3(?:0[0-5]|[68][0-9])[0-9]{11}$");
Regex regDiscover = new Regex("^65[4-9][0-9]{13}|64[4-9][0-9]{13}|6011[0-9]{12}|(622(?:12[6-9]|1[3-9][0-9]|[2-8][0-9][0-9]|9[01][0-9]|92[0-5])[0-9]{10})$");
Regex regInstaPayment = new Regex("^63[7-9][0-9]{13}$");
Regex regJCB = new Regex(@"^(?:2131|1800|35\d{3})\d{11}$");
Regex regKoreanLocal = new Regex("^9[0-9]{15}$");
Regex regLaser = new Regex("^(6304|6706|6709|6771)[0-9]{12,15}$");
Regex regMaestro = new Regex("^(5018|5020|5038|6304|6759|6761|6763)[0-9]{8,15}$");
Regex regMastercard = new Regex("^(5[1-5][0-9]{14}|2(22[1-9][0-9]{12}|2[3-9][0-9]{13}|[3-6][0-9]{14}|7[0-1][0-9]{13}|720[0-9]{12}))$");
Regex regSolo = new Regex("^(6334|6767)[0-9]{12}|(6334|6767)[0-9]{14}|(6334|6767)[0-9]{15}$");
Regex regSwitch = new Regex("^(4903|4905|4911|4936|6333|6759)[0-9]{12}|(4903|4905|4911|4936|6333|6759)[0-9]{14}|(4903|4905|4911|4936|6333|6759)[0-9]{15}|564182[0-9]{10}|564182[0-9]{12}|564182[0-9]{13}|633110[0-9]{10}|633110[0-9]{12}|633110[0-9]{13}$");
Regex regUnionPay = new Regex("^(62[0-9]{14,17})$");
Regex regVisa = new Regex("^4[0-9]{12}(?:[0-9]{3})?$");
Regex regVisaMasterCard = new Regex("^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14})$");
if (regAmex.IsMatch(CreditCardNumber))
return CreditCardType.AmericanExpress;
else if (regBCGlobal.IsMatch(CreditCardNumber))
return CreditCardType.BCGlobal;
else if (regCarteBlanche.IsMatch(CreditCardNumber))
return CreditCardType.CarteBlanche;
else if (regDinersClub.IsMatch(CreditCardNumber))
return CreditCardType.DinersClub;
else if (regDiscover.IsMatch(CreditCardNumber))
return CreditCardType.Discover;
else if (regInstaPayment.IsMatch(CreditCardNumber))
return CreditCardType.InstaPayment;
else if (regJCB.IsMatch(CreditCardNumber))
return CreditCardType.JCB;
else if (regKoreanLocal.IsMatch(CreditCardNumber))
return CreditCardType.KoreanLocal;
else if (regLaser.IsMatch(CreditCardNumber))
return CreditCardType.Laser;
else if (regMaestro.IsMatch(CreditCardNumber))
return CreditCardType.Maestro;
else if (regMastercard.IsMatch(CreditCardNumber))
return CreditCardType.Mastercard;
else if (regSolo.IsMatch(CreditCardNumber))
return CreditCardType.Solo;
else if (regSwitch.IsMatch(CreditCardNumber))
return CreditCardType.Switch;
else if (regUnionPay.IsMatch(CreditCardNumber))
return CreditCardType.UnionPay;
else if (regVisa.IsMatch(CreditCardNumber))
return CreditCardType.Visa;
else if (regVisaMasterCard.IsMatch(CreditCardNumber))
return CreditCardType.VisaMasterCard;
else
return CreditCardType.Invalid;
}
和枚举：
public enum CreditCardType
{
AmericanExpress,
BCGlobal,
CarteBlanche,
DinersClub,
Discover,
InstaPayment,
JCB,
KoreanLocal,
Laser,
Maestro,
Mastercard,
Solo,
Switch,
UnionPay,
Visa,
VisaMasterCard,
Invalid
}