我搜索了很多信用卡格式和电话号码格式。找到了很多好的提示，但没有一个真正符合我的需求，所以我创建了这段代码。你可以这样使用它:

var sf = smartForm.formatCC(myInputString);
var cardType = sf.cardType;

匹配对应卡供应商的正则表达式规则:

(4\d{12}(?:\d{3})?) (5[1-5]\d{14}) (3[47]\d{13})为美国运通。 ((?: 5020 | 5038 | 6304 | 6579 | 6761) \ d {12} (?: \ \ d) ?)大师。 (3(?:0[0-5]|[68][0-9])[0-9]{11}) (6(?:011|5[0-9]{2})[0-9]{12})用于发现。 (35[2-8][89]\d\d\d{10})

在swift中，您可以创建一个枚举来检测信用卡类型。

enum CreditCardType: Int { // Enum which encapsulates different card types and method to find the type of card.

case Visa
case Master
case Amex
case Discover

func validationRegex() -> String {
    var regex = ""
    switch self {
    case .Visa:
        regex = "^4[0-9]{6,}$"

    case .Master:
        regex = "^5[1-5][0-9]{5,}$"

    case .Amex:
        regex = "^3[47][0-9]{13}$"

    case .Discover:
        regex = "^6(?:011|5[0-9]{2})[0-9]{12}$"
    }

    return regex
}

func validate(cardNumber: String) -> Bool {
    let predicate = NSPredicate(format: "SELF MATCHES %@", validationRegex())
    return predicate.evaluateWithObject(cardNumber)
}

// Method returns the credit card type for given card number
static func cardTypeForCreditCardNumber(cardNumber: String) -> CreditCardType?  {
    var creditCardType: CreditCardType?

    var index = 0
    while let cardType = CreditCardType(rawValue: index) {
        if cardType.validate(cardNumber) {
            creditCardType = cardType
            break
        } else {
            index++
        }
    }
    return creditCardType
  }
}

调用方法CreditCardType。cardTypeForCreditCardNumber(“#卡号”)返回CreditCardType enum值。

只需一点点的勺子喂养:

$("#CreditCardNumber").focusout(function () {


        var regVisa = /^4[0-9]{12}(?:[0-9]{3})?$/;
        var regMasterCard = /^5[1-5][0-9]{14}$/;
        var regAmex = /^3[47][0-9]{13}$/;
        var regDiscover = /^6(?:011|5[0-9]{2})[0-9]{12}$/;

        if (regVisa.test($(this).val())) {
            $("#CCImage").html("<img height='40px' src='@Url.Content("~/images/visa.png")'>");          

        }

        else if (regMasterCard.test($(this).val())) {
        $("#CCImage").html("<img height='40px' src='@Url.Content("~/images/mastercard.png")'>");

        }

        else if (regAmex.test($(this).val())) {

           $("#CCImage").html("<img height='40px' src='@Url.Content("~/images/amex.png")'>");

        }
         else if (regDiscover.test($(this).val())) {

           $("#CCImage").html("<img height='40px' src='@Url.Content("~/images/discover.png")'>");

        }
        else {
        $("#CCImage").html("NA");

        }

    });

这是一个php类函数，通过CCnumber返回CCtype。 此代码不验证卡或不运行Luhn算法仅尝试查找基于本页表的信用卡类型。基本上使用CCnumber长度和CCcard前缀来确定CCcard类型。

<?php
class CreditcardType
{
    public static $creditcardTypes = [
        [
            'Name' => 'American Express',
            'cardLength' => [15],
            'cardPrefix' => ['34', '37'],
        ], [
            'Name' => 'Maestro',
            'cardLength' => [12, 13, 14, 15, 16, 17, 18, 19],
            'cardPrefix' => ['5018', '5020', '5038', '6304', '6759', '6761', '6763'],
        ], [
            'Name' => 'Mastercard',
            'cardLength' => [16],
            'cardPrefix' => ['51', '52', '53', '54', '55'],
        ], [
            'Name' => 'Visa',
            'cardLength' => [13, 16],
            'cardPrefix' => ['4'],
        ], [
            'Name' => 'JCB',
            'cardLength' => [16],
            'cardPrefix' => ['3528', '3529', '353', '354', '355', '356', '357', '358'],
        ], [
            'Name' => 'Discover',
            'cardLength' => [16],
            'cardPrefix' => ['6011', '622126', '622127', '622128', '622129', '62213','62214', '62215', '62216', '62217', '62218', '62219','6222', '6223', '6224', '6225', '6226', '6227', '6228','62290', '62291', '622920', '622921', '622922', '622923','622924', '622925', '644', '645', '646', '647', '648','649', '65'],
        ], [
            'Name' => 'Solo',
            'cardLength' => [16, 18, 19],
            'cardPrefix' => ['6334', '6767'],
        ], [
            'Name' => 'Unionpay',
            'cardLength' => [16, 17, 18, 19],
            'cardPrefix' => ['622126', '622127', '622128', '622129', '62213', '62214','62215', '62216', '62217', '62218', '62219', '6222', '6223','6224', '6225', '6226', '6227', '6228', '62290', '62291','622920', '622921', '622922', '622923', '622924', '622925'],
        ], [
            'Name' => 'Diners Club',
            'cardLength' => [14],
            'cardPrefix' => ['300', '301', '302', '303', '304', '305', '36'],
        ], [
            'Name' => 'Diners Club US',
            'cardLength' => [16],
            'cardPrefix' => ['54', '55'],
        ], [
            'Name' => 'Diners Club Carte Blanche',
            'cardLength' => [14],
            'cardPrefix' => ['300', '305'],
        ], [
            'Name' => 'Laser',
            'cardLength' => [16, 17, 18, 19],
            'cardPrefix' => ['6304', '6706', '6771', '6709'],
        ],
    ];

    public static function getType($CCNumber)
    {
        $CCNumber = trim($CCNumber);
        $type = 'Unknown';
        foreach (CreditcardType::$creditcardTypes as $card) {
            if (! in_array(strlen($CCNumber), $card['cardLength'])) {
                continue;
            }
            $prefixes = '/^(' . implode('|', $card['cardPrefix']) . ')/';
            if (preg_match($prefixes, $CCNumber) == 1) {
                $type = $card['Name'];
                break;
            }
        }
        return $type;
    }
}

一个javascript改进的@Anatoliy答案

function getCardType (number) { const numberFormated = number.replace(/\D/g, '') var patterns = { VISA: /^4[0-9]{12}(?:[0-9]{3})?$/, MASTER: /^5[1-5][0-9]{14}$/, AMEX: /^3[47][0-9]{13}$/, ELO: /^((((636368)|(438935)|(504175)|(451416)|(636297))\d{0,10})|((5067)|(4576)|(4011))\d{0,12})$/, AURA: /^(5078\d{2})(\d{2})(\d{11})$/, JCB: /^(?:2131|1800|35\d{3})\d{11}$/, DINERS: /^3(?:0[0-5]|[68][0-9])[0-9]{11}$/, DISCOVERY: /^6(?:011|5[0-9]{2})[0-9]{12}$/, HIPERCARD: /^(606282\d{10}(\d{3})?)|(3841\d{15})$/, ELECTRON: /^(4026|417500|4405|4508|4844|4913|4917)\d+$/, MAESTRO: /^(5018|5020|5038|5612|5893|6304|6759|6761|6762|6763|0604|6390)\d+$/, DANKORT: /^(5019)\d+$/, INTERPAYMENT: /^(636)\d+$/, UNIONPAY: /^(62|88)\d+$/, } for (var key in patterns) { if (patterns[key].test(numberFormated)) { return key } } } console.log(getCardType("4539 5684 7526 2091"))