Bot Email validation

gistfile1.txt

bot.dialog('email', [
    function (session, results) {
        builder.Prompts.text(session, 'What is your email address?');
    },
    function (session, results) {
        var validEmail = helpers.isEmailAddress(results.response);
        console.log('EMAIL VALIDATION: ', validEmail);
        if (validEmail == false) {
            session.say('That is not a valid email address.');
            session.replaceDialog('email');
        } else {
            session.userData.myEmail = results.response;
            console.log('My Email: ' + results.response);          
            session.userData.dialog = sessionArray[3];
            session.beginDialog(session.userData.dialog);
        }
        
    }
]);

//In a separate helpers.js file:

 //Validate email
module.exports = {
    isEmailAddress: function(str) {  
        var pattern = "^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$";        
        if (str.match(pattern)) {
            return true;
        } else {
            return false;
        } 
    }
};