Wrong return when validating regex with JavaScript

Question

Would someone take a look at my regex please? I'm trying to validate a regex group but it is matching too greedily.

/*Should match only 16 characters in total & must begin with BE and follow by 14 digits */ 
 
var re = /(?<iban>[/BE\B/(?={0-9})])/gm
     
let correctIban  = 'BE71096123456769'              // => should match
let badIbanOne   = 'BE13466123456767590kd'         // => should NOT match
let badIbanTwo   = 'BE13466123456767590679080176'  // => should NOT match
let badIbanThree = 'AZ71096123456769'              // => should NOT match

console.log(re.test(correctIban));   // => true
console.log(re.test(badIbanOne));    // => false
console.log(re.test(badIbanTwo));    // => false
console.log(re.test(badIbanThree));  // => false

Edit

Thanks for the help folks. Here is the code with capturing group syntax in ES2018 for those who want to know: (?<iban>^BE\d{14}$)

@WiktorStribiżew's regex will do what you want - why do you have all this extra stuff in your regex, like <iban>? If this is relevant to the problem you're trying to solve, please explain. — Bucket
– Bucket, Commented Mar 15, 2019 at 14:02
@AndersonPimentel In JS, no matter what to use. Here, copy/paste. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Mar 15, 2019 at 14:12

Anderson Pimentel · Accepted Answer · 2019-03-15 23:17:21Z

1

var re = /^BE\d{14}$/;

Explanation:

^ - marks start of expression
BE - literal characters'BE'
\d - any digit (same as [0-9])
{14} - quantifier - exact 14
$ - marks end of expression

All extra stuff was not needed.

You can try it here: https://regex101.com/r/4wF3NG/1

edited Mar 15, 2019 at 23:17

answered Mar 15, 2019 at 14:04

Anderson Pimentel

5,8532 gold badges37 silver badges59 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Pointy Over a year ago

Your answer would be much more helpful if it included an explanation of what you changed and why you changed it.

intercoder Over a year ago

thanks for the answers @Anderson Pimentel, and the all you folks. I added the <iban> because it's a a new thing in javascript on ES2018 perhaps, not needed but was giving it a try. Thanks for the explanation @all.

Collectives™ on Stack Overflow

Wrong return when validating regex with JavaScript

Edit

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

Edit

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related