How can I validate US Social Security Number?

Question

Anyone out there know how to improve this function? I\'m not worried about shortening the code, I\'m sure this could be done with better regex, I am more concerned about cor

Answer 1

I know this is an old question, but for the sake of others looking for answers, I figured I'd add a quick javascript function for checking that a given SSN is valid.

function checkSSN() {
    var inputSSN = #YourInput#,
        ssnRegex = new RegExp("^(9[0-9][0-9]|666|000|078051120|219099999|123456789|123121234|321214321)|^([0-8][0-9][0-9]00)|^([0-8][0-9][0-9][0-9][0-9]000)$"),
        repeats = /^(.)\1+$/;
        
    //make sure we have 2 dashes in the input Social Security number
    if( inputSSN.match(/./g).length === 2) {
        //Once we have confirmed that there are the right number of dashes, remove them, and make sure that the resulting string is a number (you may or may not need this logic depending on the format of your input SSN.
        inputSSN = inputSSN.replace(/-/g, "");

        if(!isNaN(inputSSN)) {
            //Test the input SSN against our regex to ensure that it doesn't contain any disqualifying combinations.
            if(!ssnRegex.test(inputSSN)) {
                //Make sure the input SSN isn't just a repeated number
                if(!repeats.test(inputSSN)) {
                    //If it lands inside of this, we know it's a valid option for a social security number.
                }
        }   
    }
}

For the ssnRegex logic:

The first section handles if the SSN starts with a number 900-999, 666, 000, or one of the known disqualifying SSNs mentioned above.

^(9[0-9][0-9]|666|000|078051120|219099999|123456789|123121234|321214321)

the second section ensures that the 2 digit portion isn't 00

^([0-8][0-9][0-9]00)

The third section ensures that the last portion isn't 0000

^([0-8][0-9][0-9][0-9][0-9]0000)

We additionally check to make sure they have inputted a number, and that they aren't just using a repeated number.