Question

我使用以下正则表达式来验证使用javascript的信用卡号类型

@Entity public class Emoji implements Serializable { private static long serialVersionUID = 1L; public static long getSerialVersionUID() { return serialVersionUID; } public static void setSerialVersionUID(long aSerialVersionUID) { serialVersionUID = aSerialVersionUID; } @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @ManyToOne private Utilisateur createur; private String titre; @OneToMany(cascade = CascadeType.PERSIST) private List<Message> conversations; }

以前这段代码运行得很好但是现在它显示了上面的错误。任何人都可以查看并进行任何更改吗？

Answer 1

更好的方法是使用LUHN测试。 https://en.wikipedia.org/wiki/Luhn_algorithm

/*
mod10( cardNumber )
   parameters:
      this function takes the text string card number and runs the Mod 10 formula on its respective digits.
   description:
      Mod 10 is the check digit formula for the supported cards these functions attempt to validate.
   returns:
      this function returns true if the number passes the check digit test.
      false otherwise.
*/
function mod10( cardNumber ) { // LUHN Formula for validation of credit card numbers.
   var ar = new Array( cardNumber.length );
   var i = 0,sum = 0;

   for( i = 0; i < cardNumber.length; ++i ) {
      ar[i] = parseInt(cardNumber.charAt(i));
   }
   for( i = ar.length -2; i >= 0; i-=2 ) { // you have to start from the right, and work back.
      ar[i] *= 2;                      // every second digit starting with the right most (check digit)
      if( ar[i] > 9 ) ar[i]-=9;          // will be doubled, and summed with the skipped digits.
   }                               // if the double digit is > 9, ADD those individual digits together 

   for( i = 0; i < ar.length; ++i ) {
      sum += ar[i];                   // if the sum is divisible by 10 mod10 succeeds
   }
   return (((sum%10)==0)?true:false);       
}

Answer 2

在http://www.regex101.com上输入它，它会告诉您此块中的问号：14})|?(6(应该被删除，因为问号意味着前面的标记是可选的，但它前面是或者不是令牌的运算符。请注意，这与?:不同，后者表示非捕获组。

无效的正则表达式无需重复以验证信用卡号类型

2 个答案: