Regex is not working as expected

[SAS21]

Regex should mask if the card number is exactly 15 digits(including the first two)  - not less than that not more than that

Here is the regex 

var matches = testcases.match(new RegExp('(?:^|(?<=[^0-9]))37(?:[ \t-]*\\d){13}', 'gj'));

but the above is masking the number that has 16 digits as well.

Appreciate the Help

[Jitendra Diwak1 · Accepted solution]

Hi @SAS21, 

Here is below code for the same. 

var matches = testcases.match(new RegExp('(?:^|(?<=[^0-9]))37(?:[ \t-]*\\d){13}(?![0-9])', 'gj'));

Please accept my solution if it resolves your issue and thumps 👍 up 

Thanks 

Jitendra 

[SAS21]

Thank you Jitendra!

[Community Alums]

Hi @SAS21 ,

I tried your problem in my PDI and it works for me please check below code 

var paragraph = '123456781234512';
var regex = /^(?=(?:\d\D*){1,15}$)\d+(?:[.,]\d+)?$/g;
var found = paragraph.match(regex);

gs.log("Fount = " + found);

Please mark my answer correct and helpful if this works for you

Thanks and Regards 

Sarthak