Credit Card Number

1const regex = /^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|6(?:011|5[0-9]{2})[0-9]{12})$/;
2const str = '4111111111111111';
3
4// Test if string matches
5const isMatch = regex.test(str);
6console.log('Match found:', isMatch);
7
8// Find all matches (add 'g' flag for multiple matches)
9const matches = str.match(regex);
10console.log('Matches:', matches);
11
12// Find matches with details
13let match;
14const regexWithGlobal = /^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|6(?:011|5[0-9]{2})[0-9]{12})$/g;
15while ((match = regexWithGlobal.exec(str)) !== null) {
16  console.log('Match:', match[0], 'Index:', match.index);
17}