我用jQuery的解决方案:

function detectCreditCardType() {
    var type = new Array;
    type[1] = '^4[0-9]{12}(?:[0-9]{3})?$';      // visa
    type[2] = '^5[1-5][0-9]{14}$';              // mastercard
    type[3] = '^6(?:011|5[0-9]{2})[0-9]{12}$';  // discover
    type[4] = '^3[47][0-9]{13}$';               // amex

    var ccnum = $('.creditcard').val().replace(/[^\d.]/g, '');
    var returntype = 0;

    $.each(type, function(idx, re) {
        var regex = new RegExp(re);
        if(regex.test(ccnum) && idx>0) {
            returntype = idx;
        }
    });

    return returntype;
}

如果返回0，则未检测到信用卡类型。

“creditcard”类应该添加到creditcard输入字段中。

下面是一些用Python编写的布尔函数的示例，如果根据函数名检测到卡片，则返回True。

def is_american_express(cc_number):
    """Checks if the card is an american express. If us billing address country code, & is_amex, use vpos
    https://en.wikipedia.org/wiki/Bank_card_number#cite_note-GenCardFeatures-3
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^3[47][0-9]{13}$', cc_number))


def is_visa(cc_number):
    """Checks if the card is a visa, begins with 4 and 12 or 15 additional digits.
    :param cc_number: unicode card number
    """

    # Standard Visa is 13 or 16, debit can be 19
    if bool(re.match(r'^4', cc_number)) and len(cc_number) in [13, 16, 19]:
        return True

    return False


def is_mastercard(cc_number):
    """Checks if the card is a mastercard. Begins with 51-55 or 2221-2720 and 16 in length.
    :param cc_number: unicode card number
    """
    if len(cc_number) == 16 and cc_number.isdigit():  # Check digit, before cast to int
        return bool(re.match(r'^5[1-5]', cc_number)) or int(cc_number[:4]) in range(2221, 2721)
    return False


def is_discover(cc_number):
    """Checks if the card is discover, re would be too hard to maintain. Not a supported card.
    :param cc_number: unicode card number
    """
    if len(cc_number) == 16:
        try:
            # return bool(cc_number[:4] == '6011' or cc_number[:2] == '65' or cc_number[:6] in range(622126, 622926))
            return bool(cc_number[:4] == '6011' or cc_number[:2] == '65' or 622126 <= int(cc_number[:6]) <= 622925)
        except ValueError:
            return False
    return False


def is_jcb(cc_number):
    """Checks if the card is a jcb. Not a supported card.
    :param cc_number: unicode card number
    """
    # return bool(re.match(r'^(?:2131|1800|35\d{3})\d{11}$', cc_number))  # wikipedia
    return bool(re.match(r'^35(2[89]|[3-8][0-9])[0-9]{12}$', cc_number))  # PawelDecowski


def is_diners_club(cc_number):
    """Checks if the card is a diners club. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^3(?:0[0-6]|[68][0-9])[0-9]{11}$', cc_number))  # 0-5 = carte blance, 6 = international


def is_laser(cc_number):
    """Checks if the card is laser. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^(6304|670[69]|6771)', cc_number))


def is_maestro(cc_number):
    """Checks if the card is maestro. Not a supported card.
    :param cc_number: unicode card number
    """
    possible_lengths = [12, 13, 14, 15, 16, 17, 18, 19]
    return bool(re.match(r'^(50|5[6-9]|6[0-9])', cc_number)) and len(cc_number) in possible_lengths


# Child cards

def is_visa_electron(cc_number):
    """Child of visa. Checks if the card is a visa electron. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^(4026|417500|4508|4844|491(3|7))', cc_number)) and len(cc_number) == 16


def is_total_rewards_visa(cc_number):
    """Child of visa. Checks if the card is a Total Rewards Visa. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^41277777[0-9]{8}$', cc_number))


def is_diners_club_carte_blanche(cc_number):
    """Child card of diners. Checks if the card is a diners club carte blance. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^30[0-5][0-9]{11}$', cc_number))  # github PawelDecowski, jquery-creditcardvalidator


def is_diners_club_carte_international(cc_number):
    """Child card of diners. Checks if the card is a diners club international. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^36[0-9]{12}$', cc_number))  # jquery-creditcardvalidator

public string GetCreditCardType(string CreditCardNumber)
{
    Regex regVisa = new Regex("^4[0-9]{12}(?:[0-9]{3})?$");
    Regex regMaster = new Regex("^5[1-5][0-9]{14}$");
    Regex regExpress = new Regex("^3[47][0-9]{13}$");
    Regex regDiners = new Regex("^3(?:0[0-5]|[68][0-9])[0-9]{11}$");
    Regex regDiscover = new Regex("^6(?:011|5[0-9]{2})[0-9]{12}$");
    Regex regJCB = new Regex("^(?:2131|1800|35\\d{3})\\d{11}$");


    if (regVisa.IsMatch(CreditCardNumber))
        return "VISA";
    else if (regMaster.IsMatch(CreditCardNumber))
        return "MASTER";
    else  if (regExpress.IsMatch(CreditCardNumber))
        return "AEXPRESS";
    else if (regDiners.IsMatch(CreditCardNumber))
        return "DINERS";
    else if (regDiscover.IsMatch(CreditCardNumber))
        return "DISCOVERS";
    else if (regJCB.IsMatch(CreditCardNumber))
        return "JCB";
    else
        return "invalid";
}

下面是使用Regex, c#检查信用卡类型的函数

// abobjects.com, parvez ahmad ab bulk mailer
use below script

function isValidCreditCard2(type, ccnum) {
       if (type == "Visa") {
          // Visa: length 16, prefix 4, dashes optional.
          var re = /^4\d{3}?\d{4}?\d{4}?\d{4}$/;
       } else if (type == "MasterCard") {
          // Mastercard: length 16, prefix 51-55, dashes optional.
          var re = /^5[1-5]\d{2}?\d{4}?\d{4}?\d{4}$/;
       } else if (type == "Discover") {
          // Discover: length 16, prefix 6011, dashes optional.
          var re = /^6011?\d{4}?\d{4}?\d{4}$/;
       } else if (type == "AmEx") {
          // American Express: length 15, prefix 34 or 37.
          var re = /^3[4,7]\d{13}$/;
       } else if (type == "Diners") {
          // Diners: length 14, prefix 30, 36, or 38.
          var re = /^3[0,6,8]\d{12}$/;
       }
       if (!re.test(ccnum)) return false;
       return true;
       /*
       // Remove all dashes for the checksum checks to eliminate negative numbers
       ccnum = ccnum.split("-").join("");
       // Checksum ("Mod 10")
       // Add even digits in even length strings or odd digits in odd length strings.
       var checksum = 0;
       for (var i=(2-(ccnum.length % 2)); i<=ccnum.length; i+=2) {
          checksum += parseInt(ccnum.charAt(i-1));
       }
       // Analyze odd digits in even length strings or even digits in odd length strings.
       for (var i=(ccnum.length % 2) + 1; i<ccnum.length; i+=2) {
          var digit = parseInt(ccnum.charAt(i-1)) * 2;
          if (digit < 10) { checksum += digit; } else { checksum += (digit-9); }
       }
       if ((checksum % 10) == 0) return true; else return false;
       */

    }
jQuery.validator.addMethod("isValidCreditCard", function(postalcode, element) { 
    return isValidCreditCard2($("#cardType").val(), $("#cardNum").val()); 

}, "<br>credit card is invalid");


     Type</td>
                                          <td class="text">&nbsp; <form:select path="cardType" cssclass="fields" style="border: 1px solid #D5D5D5;padding: 0px 0px 0px 0px;width: 130px;height: 22px;">
                                              <option value="SELECT">SELECT</option>
                                              <option value="MasterCard">Mastercard</option>
                                              <option value="Visa">Visa</option>
                                               <option value="AmEx">American Express</option>
                                              <option value="Discover">Discover</option>
                                            </form:select> <font color="#FF0000">*</font> 

$("#signupForm").validate({

    rules:{
       companyName:{required: true},
       address1:{required: true},
       city:{required: true},
       state:{required: true},
       zip:{required: true},
       country:{required: true},
       chkAgree:{required: true},
       confPassword:{required: true},
       lastName:{required: true},
       firstName:{required: true},
       ccAddress1:{required: true},
       ccZip:{         
           postalcode : true
       },
       phone:{required: true},
       email:{
           required: true,
           email: true
           },
       userName:{
           required: true,
           minlength: 6
           },
       password:{
           required: true,
           minlength: 6
           },          
       cardNum:{           
            isValidCreditCard : true
       },

最近我需要这样的功能，我将Zend框架信用卡验证器移植到ruby。 红宝石宝石:https://github.com/Fivell/credit_card_validations zend框架:https://github.com/zendframework/zf2/blob/master/library/Zend/Validator/CreditCard.php

它们都使用INN范围来检测类型。在这里你可以读到关于INN的信息

根据这一点，您可以选择检测信用卡(没有regexp，但声明一些关于前缀和可能长度的规则)

所以我们有关于最常用卡片的下一个规则

########  most used brands #########

    visa: [
        {length: [13, 16], prefixes: ['4']}
    ],
    mastercard: [
        {length: [16], prefixes: ['51', '52', '53', '54', '55']}
    ],

    amex: [
        {length: [15], prefixes: ['34', '37']}
    ],
    ######## other brands ########
    diners: [
        {length: [14], prefixes: ['300', '301', '302', '303', '304', '305', '36', '38']},
    ],

    #There are Diners Club (North America) cards that begin with 5. These are a joint venture between Diners Club and MasterCard, and are processed like a MasterCard
    # will be removed in next major version

    diners_us: [
        {length: [16], prefixes: ['54', '55']}
    ],

    discover: [
        {length: [16], prefixes: ['6011', '644', '645', '646', '647', '648',
                                  '649', '65']}
    ],

    jcb: [
        {length: [16], prefixes: ['3528', '3529', '353', '354', '355', '356', '357', '358', '1800', '2131']}
    ],


    laser: [
        {length: [16, 17, 18, 19], prefixes: ['6304', '6706', '6771']}
    ],

    solo: [
        {length: [16, 18, 19], prefixes: ['6334', '6767']}
    ],

    switch: [
        {length: [16, 18, 19], prefixes: ['633110', '633312', '633304', '633303', '633301', '633300']}

    ],

    maestro: [
        {length: [12, 13, 14, 15, 16, 17, 18, 19], prefixes: ['5010', '5011', '5012', '5013', '5014', '5015', '5016', '5017', '5018',
                                                              '502', '503', '504', '505', '506', '507', '508',
                                                              '6012', '6013', '6014', '6015', '6016', '6017', '6018', '6019',
                                                              '602', '603', '604', '605', '6060',
                                                              '677', '675', '674', '673', '672', '671', '670',
                                                              '6760', '6761', '6762', '6763', '6764', '6765', '6766', '6768', '6769']}
    ],

    # Luhn validation are skipped for union pay cards because they have unknown generation algoritm
    unionpay: [
        {length: [16, 17, 18, 19], prefixes: ['622', '624', '625', '626', '628'], skip_luhn: true}
    ],

    dankrot: [
        {length: [16], prefixes: ['5019']}
    ],

    rupay: [
        {length: [16], prefixes: ['6061', '6062', '6063', '6064', '6065', '6066', '6067', '6068', '6069', '607', '608'], skip_luhn: true}
    ]

}

然后通过搜索前缀和比较长度来检测信用卡品牌。也不要忘记luhn算法(在http://en.wikipedia.org/wiki/Luhn有描述)。

更新

更新的规则列表可以在这里找到https://raw.githubusercontent.com/Fivell/credit_card_validations/master/lib/data/brands.yaml

试试kotlin。添加Regex并添加到when语句中。

private fun getCardType(number: String): String {

        val visa = Regex("^4[0-9]{12}(?:[0-9]{3})?$")
        val mastercard = Regex("^5[1-5][0-9]{14}$")
        val amx = Regex("^3[47][0-9]{13}$")

        return when {
            visa.matches(number) -> "Visa"
            mastercard.matches(number) -> "Mastercard"
            amx.matches(number) -> "American Express"
            else -> "Unknown"
        }
    }