Validate NINO Functions (Node)

ninoCheck.js

// National Insurance Validation Module.

// Sanitise the NINO by first passing through this function, which will strip out space and dashes, then convert to uppercase.
exports.sanitise = function sanitise(nino) {
    return nino.toUpperCase().replace(/[\s|\-]/g, '');
};

// You can make the last letter optional by using this function.
exports.validateLoose = function validateLoose(nino) {
    var regex = /^(?!BG|GB|NK|KN|TN|NT|ZZ)[A-CEGHJ-PR-TW-Z]{1}[A-CEGHJ-NPR-TW-Z]{1}[0-9]{6}[A-D]{0,1}$/;
    return regex.test(nino);
};

// You can make the last letter mandatory by using this function.
exports.validateStrict = function validateStrict(nino) {
    var regex = /^(?!BG|GB|NK|KN|TN|NT|ZZ)[A-CEGHJ-PR-TW-Z]{1}[A-CEGHJ-NPR-TW-Z]{1}[0-9]{6}[A-D]{1}$/;
    return regex.test(nino);
};

validatePage.js

var ninoChecker = require(appRootDirectory + '/app/functions/ninoCheck');

function (req, res) {
    var ninoRaw = req.body.ninoField; //Get the value from the input and assign to a var.
    var sanitisedNino = ninoChecker.sanitise(ninoRaw); // Run it through the optional sanitiser
  
    //Finally attempt to validate the NINO using either (1) or (2).
    var convertedNino =  ninoChecker.validateStrict(sanitisedNino); //(1)
    var convertedNino =  ninoChecker.validateLoose(sanitisedNino); //(2)
}