java 用于确定 Android 中信用卡的正则表达式
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Regex for determining credit cards in Android
提问by AIntel
I'm really new to regex but I think my problem might go beyond that at the moment. As the title says, I'm trying to determine if a credit card is visa, amex, master card etc.
我对正则表达式真的很陌生，但我认为目前我的问题可能不止于此。正如标题所说，我试图确定信用卡是否是签证、美国运通卡、万事达卡等。
I looked at this post which gave the regular expression for each of the card types:
我查看了这篇文章，其中给出了每种卡片类型的正则表达式：
How do you detect Credit card type based on number?
This is the code I then used but it doesn't do anything at all:
这是我然后使用的代码，但它根本没有做任何事情：
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,}$");
Log.d("DEBUG", "afterTextChanged : "+s);
String ccNum = s.toString();
Matcher matcher = pattern.matcher(ccNum);
if(matcher.matches()){
Log.d("DEBUG", "afterTextChanged : discover");
}
}
});
The regexp in the pattern.compile function is for determining Discover cards according to the post above. I've noticed that I really can't get anything to work other than the "^" in regex (i.e ("^4" - visa, "^6001" discover) however this is obviously not sufficient in the case of editing for example. Any ideas what's up? I thought this could be an issue with my Java, but I am running Java 7
pattern.compile 函数中的正则表达式用于根据上面的帖子确定发现卡。我注意到除了正则表达式中的“^”（即（“^4” - 签证，“^ 6001”发现）之外，我真的无法获得任何工作，但是在编辑的情况下，这显然是不够的示例。有什么想法吗？我认为这可能是我的 Java 的问题，但我正在运行 Java 7
I might want to make this a new question, but I am also wondering how regex can be used to get spacing correct for various credit cards even if a user goes back and edits the number (xxxx xxxx xxxx xxxx)
我可能想提出一个新问题，但我也想知道如何使用正则表达式来使各种信用卡的间距正确，即使用户返回并编辑数字 (xxxx xxxx xxxx xxxx)
EDIT: Added the DEBUG log from above. My input is a few digits that should associate with certain credit cards. Currently I am using Eagle Eye's code provided below (which should also work for detecting that the input is ONE of the card types):
编辑：从上面添加了调试日志。我的输入是一些应该与某些信用卡相关联的数字。目前我正在使用下面提供的 Eagle Eye 的代码（它也应该用于检测输入是一种卡片类型）：
final ArrayList listOfPattern=new ArrayList();
最终 ArrayList listOfPattern=new ArrayList();
String ptVisa = "^4[0-9]{6,}$";
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;
}
}
}
});
Log:
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
You'd expect the log "discover" to come out a few times for the different digits I've entered. The above log shows me typing in the first few digits of a visa card and a discover card.
对于我输入的不同数字，您会期望日志“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。
EDIT ANSWER FOUND: I simply wasn't typing in enough digits for the card to be recognized!
编辑答案发现：我只是没有输入足够的数字来识别卡！
回答by Vilas
According to one of the answers in the thread, The cards can be validated based on following data.
根据线程中的一个答案，可以根据以下数据验证卡。
Visa:^4[0-9]{6,}$Visa card numbers start with a 4.
Visa：^4[0-9]{6,}$Visa 卡号以 4 开头。
MasterCard:^5[1-5][0-9]{5,}$MasterCard numbers start with the numbers 51 through 55, but this will only detect MasterCard credit cards; there are other cards issued using the MasterCard system that do not fall into this IIN range.
MasterCard：^5[1-5][0-9]{5,}$MasterCard 号码以数字 51 到 55 开头，但这只会检测 MasterCard 信用卡；还有其他使用万事达卡系统发行的卡不属于此 IIN 范围。
American Express:^3[47][0-9]{5,}$American Express card numbers start with 34 or 37.
美国运通：^3[47][0-9]{5,}$美国运通卡号以 34 或 37 开头。
Diners Club:^3(?:0[0-5]|[68][0-9])[0-9]{4,}$Diners Club card numbers begin with 300 through 305, 36 or 38. There are Diners Club cards that begin with 5 and have 16 digits. These are a joint venture between Diners Club and MasterCard, and should be processed like a MasterCard.
Diners Club：^3(?:0[0-5]|[68][0-9])[0-9]{4,}$Diners Club 卡号以 300 到 305、36 或 38 开头。有一些 Diners Club 卡以 5 开头并有 16 位数字。这些是大来卡和万事达卡的合资企业，应该像万事达卡一样处理。
Discover:^6(?:011|5[0-9]{2})[0-9]{3,}$Discover card numbers begin with 6011 or 65.
Discover：^6(?:011|5[0-9]{2})[0-9]{3,}$Discover 卡号以 6011 或 65 开头。
JCB:^(?:2131|1800|35[0-9]{3})[0-9]{3,}$JCB cards begin with 2131, 1800 or 35.
JCB：^(?:2131|1800|35[0-9]{3})[0-9]{3,}$JCB 卡以 2131、1800 或 35 开头。
So you need to create separate pattern for each case. You can do as follows.
因此，您需要为每种情况创建单独的模式。您可以执行以下操作。
ArrayList<String> listOfPattern=new ArrayList<String>();
String ptVisa = "^4[0-9]{6,}$";
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);
}
and then,
接着，
@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;
}
}
}
And for your last question, The following thread should help you.
对于您的最后一个问题，以下线程应该可以帮助您。
Format credit card in edit text in android
EDIT:
编辑：
If the card number is 16 digits for example, After applying the logic to add spaces after 4 digits, you need to remove those spaces when you process the actual card number. Then only the above logic will work.
以卡号为16位为例，应用4位后加空格的逻辑后，在处理实际卡号时需要去掉这些空格。那么只有上面的逻辑会起作用。
Hope this helps.
希望这可以帮助。
回答by Pinakin
Use following class to validate you card.
使用以下类来验证您的卡。
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();
}
}
}
