How to Validate if a PAN Card is valid or not in Jquery or Javascript

// Function to validate if a PAN card is valid or not in jquery
function validatePAN(Pan) {
    var PAN_Card_No = Pan.toUpperCase();
    var regex = /([A-Z]){5}([0-9]){4}([A-Z]){1}$/;
    if (PAN_Card_No.length == 10) {
        if (PAN_Card_No.match(regex)) {
            return "Valid Pan Number";
        } else {
            return "InValid Pan Number";
        }
    } else {
        return "Enter Valid Pan Number";
    }
};

//Test Cases and Outputs

console.log(validatePAN('HSHFH8989L'));
// Output ==> "Valid Pan Number"

console.log(validatePAN('HSHFHQ989Q'));
// Output ==> "Valid Pan Number"

console.log(validatePAN('HSHS8989Q'));
// Output ==> "Enter Valid Pan Number"

// Entered PAN in lower Case
console.log(validatePAN('fdsdd8585d'));
// Output ==> "Valid Pan Number"

// Function to validate if a PAN card is valid or not in Javascript
function validatePAN(Pan) {
    var PAN_Card_No = Pan.toUpperCase();
    var regex = /([A-Z]){5}([0-9]){4}([A-Z]){1}$/;
    //value is tested using a Regular Expression.
    if (regex.test(PAN_Card_No)) {
        //If the enter PAN card Number format is correct then it returns true
        return true;
    } else {
        //If the enter PAN card Number format is correct then it returns false
        return false;
    }
};

//Test Cases and Outputs

console.log(validatePAN('HSHFH8989L'));
// Output ==> "it returns true"

console.log(validatePAN('HSHFHQ989Q'));
// Output ==> "it returns false"

console.log(validatePAN('HSHS8989Q'));
// Output ==> "it returns false"

// Entered PAN in lower Case
console.log(validatePAN('fdsdd8585d'));
// Output ==> "it returns true"