const regex = /\b6(?:011|5[0-9]{2})[ -]([0-9]{4}[ -]){2}([0-9]{4})\b|\b6(?:011|5[0-9]{2})(?:[0-9]{12})?$\b/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\b6(?:011|5[0-9]{2})[ -]([0-9]{4}[ -]){2}([0-9]{4})\\b|\\b6(?:011|5[0-9]{2})(?:[0-9]{12})?$\\b', 'gm')
const str = `Discover
Requirements: Discover cards start with the number 6011 or 65 and have 16 digits.
Pattern Parts:
Starts with number 6011 or 65, has 16 length, and has space or dash:
1) \\b6(?:011|5[0-9]{2})[ -]([0-9]{4}[ -]){2}([0-9]{4})\\b
Starts with number 6011 or 65, has 16 length, and has no space or dash:
2) \\b6(?:011|5[0-9]{2})(?:[0-9]{12})?\$\\b
Combining 1-2 to form one pattern:
\\b6(?:011|5[0-9]{2})[ -]([0-9]{4}[ -]){2}([0-9]{4})\\b|\\b6(?:011|5[0-9]{2})(?:[0-9]{12})?\$\\b
Test Cases:
Positive (Should fire):
16 length, no space, start with 6011 6011123412341234
16 length, dashes, start with 6011 6011-1234-1234-1234
16 length, spaces, start with 6011 6011 1234-1234-1234
16 length, no space, start with 65 6521123412341234
16 length, dashes, start with 65 6521-1234-1234-1234
16 length, spaces, start with 65 6521 1234 1234 1234
Embedded in sentence with space:
16 length, no space, start with 6011 Here is the cc: 6011123412341234
16 length, dashes, start with 6011 Here is the cc: 6011-1234-1234-1234
16 length, spaces, start with 6011 Here is the cc: 6011 1234-1234-1234
16 length, no space, start with 65 Here is the cc: 6521123412341234
16 length, dashes, start with 65 Here is the cc: 6521-1234-1234-1234
16 length, spaces, start with 65 Here is the cc: 6523 1234-1234-1234
16 length, no space, start with 6011 Credit Card#:6011123412341234
16 length, dashes, start with 6011 Credit Card#:6011-1234-1234-1234
16 length, spaces, start with 6011 Credit Card#:6011 1234-1234-1234
16 length, no space, start with 65 Credit Card#:6521123412341234
16 length, dashes, start with 65 Credit Card#:6521-1234-1234-1234
16 length, spaces, start with 65 Credit Card#:6523 1234-1234-1234
Negative (Should Not Fire):
16 length, no space, not start with 6011 6012123412341234
16 length, dashes, not start with 6011 6012-1234-1234-1234
16 length, spaces, not start with 6011 6012 1234 1234 1234
16 length, no space, not start with 65 6612123412341234
16 length, dashes, not start with 65 6612-1234-1234-1234
16 length, spaces, not start with 65 6612-1234-1234-1234
16 length, no space, start with 65, embedded Credit Card Number6521123412341234
16 length, dashes, start with 6011, malformed 601-11234-1234-1234
16 length num matching pattern but embedded User ID: 0000006011123412341234000000`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions