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

[Robbie]

Hi @SAS21,

Just to make things a little clearer, can you provide an example of both a valid and non valid card number please.

To help others (or for me to help you more directly), please mark this response correct by clicking on Accept as Solution and/or Kudos.

Thanks, Robbie

[SAS21]

Hi Robbie , 

Here is the code i am trying

var testcases = 'a3711111111111\na37222222222222\n3711 11111 1111\n3711---11111-1111\nMycardnumberis373737373737373\nThis should not match: 1234567812345';
var matches = testcases.match(new RegExp('(?:^|(?<=[^0-9]))37(?:[ \t-]*\\d){13}', 'gj'));
gs.info('Test Cases:\n' + testcases + '\n');
gs.info('Matches:');
for(var i in matches)
gs.info(matches[i]);

[Robbie]

Hi @SAS21,

Thanks for providing the script. Running it via a background script the match appears on "373737373737373"currently.

What I was after was explicit examples of what are valid card numbers where you want the match, and examples where it should not match.

For example:

- "A12345678901234" - Should this match? (15 chars in total of which after the initial letter, 14 numbers follow)

- "A123456789012345" - Should this match? (16 chars in total of which after the initial letter, 15 numbers follow)

- "AB123456789012345" - Should this match? (17 chars in total of which after the initial letter, 15 numbers follow)

I assume spaces and other 'special characters' are not allowed. Please confirm the above as to which ones are valid and if spaces / special chars are not allowed.

To help others (or for me to help you more directly), please mark this response correct by clicking on Accept as Solution and/or Kudos.

Thanks, Robbie

[Community Alums]

Hi @SAS21 ,

Try using :

@"\b(?:\d[ -]*?){11,15}(?=\d{15}\b)";