validate email using regex

backend/helpers/email.js

@@ -1,7 +1,7 @@
 const nodemailer = require ('nodemailer');
 
 module.exports = {
-  validateEmailFromAlexaResponse: function (email) {
+  transformEmailFromAlexaResponse: function (email) {
     //email from alexa response will contain words instead of symbols, like :
     //at = @
     //underscore = _
@@ -14,10 +14,13 @@ module.exports = {
       .replace (/dash/gi, '-')
       .replace (/dot/gi, '.');
 
-    //Validate here with some email validation regex
+    return transformedEmail;
+  },
 
-    //return true if email is valid
-    return true;
+  isEmailValid : function(email){
+      let validEmailRegex = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
+
+      return validEmailRegex.test(email);
   },
 
   sendEmal: function (name, fromEmail, message, toEmail) {