IBAN Regex设计 [英] IBAN Regex design

问题描述

请帮助我设计可将所有IBAN与所有可能的空格匹配的Regex.因为我已经找到了，但是它不适用于空格.

Help me please to design Regex that will match all IBANs with all possible whitespaces. Because I've found that one, but it does not work with whitespaces.

[a-zA-Z]{2}[0-9]{2}[a-zA-Z0-9]{4}[0-9]{7}([a-zA-Z0-9]?){0,16}

我至少需要以下格式:

DE89 3704 0044 0532 0130 00
AT61 1904 3002 3457 3201
FR14 2004 1010 0505 0001 3

推荐答案

仅以这些国家/地区的IBAN为例:
以2个字母开头，然后是2个数字.
然后每4位数字前留一个空格，可以选择以1或2位数字结尾:

Just for the example IBAN's from those countries :
Start with 2 letters then 2 digits.
Then allow a space before every 4 digits, optionally ending with 1 or 2 digits:

\b[A-Z]{2}[0-9]{2}(?:[ ]?[0-9]{4}){4}(?!(?:[ ]?[0-9]){3})(?:[ ]?[0-9]{1,2})?\b    

regex101在此处进行测试

请注意，如果要验证完整的字符串，则可以简化正则表达式.
由于这样就不需要负的前瞻(?!...).
边界\b一词可以用该行的开头^和结尾$代替.

Note that if the intention is to validate a complete string, that the regex can be simplified.
Since the negative look-ahead (?!...) won't be needed then.
And the word boundaries \b can be replaced by the start ^ and end $ of the line.

^[A-Z]{2}[0-9]{2}(?:[ ]?[0-9]{4}){4}(?:[ ]?[0-9]{1,2})?$

此外，如果4组4个相连的数字无关紧要，则可以简化得更多.

Also, that one can be simplified even more if having 4 groups of 4 connected digits doesn't matter.

^[A-Z]{2}(?:[ ]?[0-9]){18,20}$

备注

但是，如果您想与世界各地的IBAN号码相匹配?
然后，IBAN的BBAN部分最多可以包含30个数字或大写字母. 参考
并且可以用空格或破折号或之间没有空格的方式写.
例如:CC12 XXXX 12XX 1234 1234 1234 1234 1234 123

But if you want to match an IBAN number from accross the world?
Then the BBAN part of the IBAN is allowed to have up to 30 numbers or uppercase letters. Reference
And can be written with either spaces or dashes or nothing in between.
For example: CC12 XXXX 12XX 1234 1234 1234 1234 1234 123

因此匹配长IBAN字符串的正则表达式将变得更长.

So the regex to match a string with a long IBAN would become a bit longer.

^([A-Z]{2}[ \-]?[0-9]{2})(?=(?:[ \-]?[A-Z0-9]){9,30}$)((?:[ \-]?[A-Z0-9]{3,5}){2,7})([ \-]?[A-Z0-9]{1,3})?$

regex101在此处进行测试

还请注意，纯正则表达式解决方案无法进行计算.
因此，要实际验证IBAN编号，则需要额外的代码.

Also note, that a pure regex solution can't do calculations.
So to actually validate an IBAN number then extra code is required.

JavaScript代码段示例:

function smellsLikeIban(str){
 return /^([A-Z]{2}[ \-]?[0-9]{2})(?=(?:[ \-]?[A-Z0-9]){9,30}$)((?:[ \-]?[A-Z0-9]{3,5}){2,7})([ \-]?[A-Z0-9]{1,3})?$/.test(str);
}

function validateIbanChecksum(iban) {       
  const ibanStripped = iban.replace(/[^A-Z0-9]+/gi,'') //keep numbers and letters only
                           .toUpperCase(); //calculation expects upper-case
  const m = ibanStripped.match(/^([A-Z]{2})([0-9]{2})([A-Z0-9]{9,30})$/);
  if(!m) return false;
  
  const numbericed = (m[3] + m[1] + m[2]).replace(/[A-Z]/g,function(ch){
                        //replace upper-case characters by numbers 10 to 35
                        return (ch.charCodeAt(0)-55); 
                    });
  //The resulting number would be to long for javascript to handle without loosing precision.
  //So the trick is to chop the string up in smaller parts.
  const mod97 = numbericed.match(/\d{1,7}/g)
                          .reduce(function(total, curr){ return Number(total + curr)%97},'');

  return (mod97 === 1);
};

var arr = [
 'DE89 3704 0044 0532 0130 00', // ok
 'AT61 1904 3002 3457 3201', // ok
 'FR14 2004 1010 0505 0001 3', // wrong checksum
 'GB82-WEST-1234-5698-7654-32', // ok
 'NL20INGB0001234567', // ok
 'XX00 1234 5678 9012 3456 7890 1234 5678 90', // smells ok
 'YY00123456789012345678901234567890', // smells ok
 'NL20-ING-B0-00-12-34-567', // wrong format, but valid checksum
 'XX22YYY1234567890123', // wrong checksum
 '[e-mail]' // Not even smells like IBAN
];
arr.forEach(function (str) {
  console.log('['+ str +'] Smells Like IBAN:    '+ smellsLikeIban(str));
  console.log('['+ str +'] Valid IBAN Checksum: '+ validateIbanChecksum(str))
});

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