用于确定Android中信用卡的正则表达式

时间：2015-01-29 04:53:23

标签： java android regex

我对正则表达式真的很陌生，但我认为我的问题可能会超出目前的范围。正如标题所说，我正在试图确定信用卡是签证，美国运通卡，万事达卡等。

我查看了这篇文章，其中给出了每种卡类型的正则表达式：

How do you detect Credit card type based on number?

这是我之后使用的代码，但它根本不做任何事情：

etCCNum.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {



            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                Log.d("DEBUG", "beforeTextChanged : "+s);

            }

            @Override
            public void afterTextChanged(Editable s) {
                Pattern pattern = Pattern.compile("^6(?:011|5[0-9]{2})[0-9]{3,}$");
                Log.d("DEBUG", "afterTextChanged : "+s);
                String ccNum = s.toString();
                Matcher matcher = pattern.matcher(ccNum);
               if(matcher.matches()){
                   Log.d("DEBUG", "afterTextChanged : discover");
               }

            }
        });

pattern.compile函数中的regexp用于根据上面的帖子确定Discover卡。我注意到除了正则表达式中的“^”之外我真的无法工作（即（“^ 4” - 签证，“^ 6001”发现）但是在编辑时这显然是不够的例子。任何想法是什么？我认为这可能是我的Java的一个问题，但我正在运行Java 7

我可能想把它作为一个新问题，但我也想知道如何使用正则表达式来获得各种信用卡的间距，即使用户返回并编辑数字（xxxx xxxx xxxx xxxx）

编辑：从上面添加了DEBUG日志。我的输入是一些应该与某些信用卡相关联的数字。目前我正在使用下面提供的Eagle Eye代码（这也适用于检测输入是其中一种卡类型）：

final ArrayList listOfPattern = new ArrayList（）; 

String ptVisa = "^4[0-9]{6,}$";
listOfPattern.add(ptVisa);
String ptMasterCard = "^5[1-5][0-9]{5,}$";
listOfPattern.add(ptMasterCard);
String ptAmeExp = "^3[47][0-9]{5,}$";
listOfPattern.add(ptAmeExp);
String ptDinClb = "^3(?:0[0-5]|[68][0-9])[0-9]{4,}$";
listOfPattern.add(ptDinClb);
String ptDiscover = "^6(?:011|5[0-9]{2})[0-9]{3,}$";
listOfPattern.add(ptDiscover);
String ptJcb = "^(?:2131|1800|35[0-9]{3})[0-9]{3,}$";
listOfPattern.add(ptJcb);


etCCNum.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {



    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        Log.d("DEBUG", "beforeTextChanged : "+s);

    }

    @Override
    public void afterTextChanged(Editable s) {
        Log.d("DEBUG", "afterTextChanged : "+s);
        String ccNum = s.toString();
        for(String p:listOfPattern){
            if(ccNum.matches(p)){
                Log.d("DEBUG", "afterTextChanged : discover");
                break;
            }
        }

    }
});

日志：

01-29 15:16:41.932  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged :
01-29 15:16:41.933  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 4
01-29 15:16:46.815  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 4
01-29 15:16:46.816  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged :
01-29 15:16:50.925  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged :
01-29 15:16:50.926  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 6
01-29 15:16:51.542  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 6
01-29 15:16:51.543  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 60
01-29 15:16:51.883  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 60
01-29 15:16:51.883  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 600
01-29 15:16:52.928  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 600
01-29 15:16:52.929  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 6001
01-29 15:16:55.781  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 6001
01-29 15:16:55.782  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 600
01-29 15:16:56.206  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 600
01-29 15:16:56.206  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 60
01-29 15:16:57.659  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 60
01-29 15:16:57.660  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 605
01-29 15:16:59.297  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 605
01-29 15:16:59.298  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 60
01-29 15:16:59.527  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 60
01-29 15:16:59.527  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 6
01-29 15:17:00.314  26194-26194/com.x.x D/DEBUG﹕ beforeTextChanged : 6
01-29 15:17:00.314  26194-26194/com.x.x D/DEBUG﹕ afterTextChanged : 65

对于我输入的不同数字，您希望日志“发现”出现几次。上面的日志显示我输入了签证卡和发现卡的前几位数字。

编辑答案：我根本没有输入足够的数字来识别卡片！

2 个答案:

答案 0 :(得分：16)

根据帖子中的一个答案，可以根据以下数据验证卡片。

签证： ^4[0-9]{6,}$ Visa卡号码以4开头。

万事达卡： ^5[1-5][0-9]{5,}$万事达卡号码以数字51到55开头，但这只会检测万事达信用卡;使用万事达卡系统发行的其他卡不属于此IIN范围。

美国运通： ^3[47][0-9]{5,}$美国运通卡号码以34或37开头。

大莱卡： ^3(?:0[0-5]|[68][0-9])[0-9]{4,}$大莱卡的卡号从300到305,36或38开头。大莱卡的卡片以5开头，有16位数字。这些是大莱卡和万事达卡之间的合资企业，应该像万事达卡一样处理。

发现 ^6(?:011|5[0-9]{2})[0-9]{3,}$发现卡号以6011或65开头。

JCB： ^(?:2131|1800|35[0-9]{3})[0-9]{3,}$ JCB卡以2131,1800或35开头。

因此，您需要为每个案例创建单独的模式。你可以这样做。

ArrayList<String> listOfPattern=new ArrayList<String>();

String ptVisa = "^4[0-9]{6,}$";
listOfPattern.add(ptVisa);
String ptMasterCard = "^5[1-5][0-9]{5,}$";
listOfPattern.add(ptMasterCard);
String ptAmeExp = "^3[47][0-9]{5,}$";
listOfPattern.add(ptAmeExp);
String ptDinClb = "^3(?:0[0-5]|[68][0-9])[0-9]{4,}$";
listOfPattern.add(ptDinClb);
String ptDiscover = "^6(?:011|5[0-9]{2})[0-9]{3,}$";
listOfPattern.add(ptDiscover);
String ptJcb = "^(?:2131|1800|35[0-9]{3})[0-9]{3,}$";
listOfPattern.add(ptJcb);
}

然后，

@Override
public void afterTextChanged(Editable s) {
Log.d("DEBUG", "afterTextChanged : "+s);
String ccNum = s.toString();
   for(String p:listOfPattern){
      if(ccNum.matches(p)){
         Log.d("DEBUG", "afterTextChanged : discover");
         break;
      }
   }
}

对于您的上一个问题，以下主题可以帮助您。

Format credit card in edit text in android

修改

例如，如果卡号为16位，则在应用逻辑后添加4位数后的空格后，需要在处理实际卡号时删除这些空格。那么只有上述逻辑才有效。

希望这有帮助。

答案 1 :(得分：0)

使用以下课程验证您的卡片。

public class Validator {


public static final byte VISA = 0;
public static final byte MASTERCARD = 1;
public static final byte AMEX = 2;
public static final byte DINERS_CLUB = 3;
public static final byte CARTE_BLANCHE = 4;
public static final byte DISCOVER = 5;
public static final byte ENROUTE = 6;
public static final byte JCB = 7;

public static boolean validate(final String credCardNumber, final byte type) {
    String creditCard = credCardNumber.trim();
    boolean applyAlgo = false;
    switch (type) {
        case VISA:
            // VISA credit cards has length 13 - 15
            // VISA credit cards starts with prefix 4
            if (creditCard.length() >= 13 && creditCard.length() <= 16
                    && creditCard.startsWith("4")) {
                applyAlgo = true;
            }
            break;
        case MASTERCARD:
            // MASTERCARD has length 16
            // MASTER card starts with 51, 52, 53, 54 or 55
            if (creditCard.length() == 16) {
                int prefix = Integer.parseInt(creditCard.substring(0, 2));
                if (prefix >= 51 && prefix <= 55) {
                    applyAlgo = true;
                }
            }
            break;
        case AMEX:
            // AMEX has length 15
            // AMEX has prefix 34 or 37
            if (creditCard.length() == 15
                    && (creditCard.startsWith("34") || creditCard
                    .startsWith("37"))) {
                applyAlgo = true;
            }
            break;
        case DINERS_CLUB:
        case CARTE_BLANCHE:
            // DINERSCLUB or CARTEBLANCHE has length 14
            // DINERSCLUB or CARTEBLANCHE has prefix 300, 301, 302, 303, 304,
            // 305 36 or 38
            if (creditCard.length() == 14) {
                int prefix = Integer.parseInt(creditCard.substring(0, 3));
                if ((prefix >= 300 && prefix <= 305)
                        || creditCard.startsWith("36")
                        || creditCard.startsWith("38")) {
                    applyAlgo = true;
                }
            }
            break;
        case DISCOVER:
            // DISCOVER card has length of 16
            // DISCOVER card starts with 6011
            if (creditCard.length() == 16 && creditCard.startsWith("6011")) {
                applyAlgo = true;
            }
            break;
        case ENROUTE:
            // ENROUTE card has length of 16
            // ENROUTE card starts with 2014 or 2149
            if (creditCard.length() == 16
                    && (creditCard.startsWith("2014") || creditCard
                    .startsWith("2149"))) {
                applyAlgo = true;
            }
            break;
        case JCB:
            // JCB card has length of 16 or 15
            // JCB card with length 16 starts with 3
            // JCB card with length 15 starts with 2131 or 1800
            if ((creditCard.length() == 16 && creditCard.startsWith("3"))
                    || (creditCard.length() == 15 && (creditCard
                    .startsWith("2131") || creditCard
                    .startsWith("1800")))) {
                applyAlgo = true;
            }
            break;
        default:
            throw new IllegalArgumentException();
    }
    if (applyAlgo) {
        return validate(creditCard);
    }
    return false;
}

public static boolean validate(String creditCard) {
    // 4 9 9 2 7 3 9 8 7 1 6
    // 6
    // 1 x 2 = 2  = (0 + 2) = 2
    // 7
    // 8 x 2 = 16 = (1 + 6) = 7
    // 9
    // 3 x 2 = 6 = (0 + 6) = 6
    // 7
    // 2 x 2 = 4 = (0 + 4) = 4
    // 9
    // 9 X 2 = 18 = (1 + 8) = 9
    // 4
    // 6+2+7+7+9+6+7+4+9+9+4 = 70
    // return 0 == (70 % 10)
    int sum = 0;
    int length = creditCard.length();
    for (int i = 0; i < creditCard.length(); i++) {
        if (0 == (i % 2)) {
            sum += creditCard.charAt(length - i - 1) - '0';
        } else {
            sum += sumDigits((creditCard.charAt(length - i - 1) - '0') * 2);
        }
    }
    return 0 == (sum % 10);
}

private static int sumDigits(int i) {
    return (i % 10) + (i / 10);
}



public final static boolean isValidEmail(CharSequence target) {
    return !TextUtils.isEmpty(target) && android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches();
}

}

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