Better email validator domain regex #612

Regex now accepts 'admin@mailserver1' as valid and dot-suffixes as optional. Prefix validation remains untouched.

src/js/validator/emailAddress.js

@@ -32,7 +32,7 @@
 
             // Email address regular expression
             // http://stackoverflow.com/questions/46155/validate-email-address-in-javascript
-            var emailRegExp   = /^(([^<>()[\]\\.,;:\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,}))$/,
+            var emailRegExp   = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/,
                 allowMultiple = options.multiple === true || options.multiple === 'true';
 
             if (allowMultiple) {