Modified EmailValidator add links to rfc specifications.

validator/EmailValidator.php

@@ -9,7 +9,12 @@
 
 class EmailValidator extends RegexValidator
 {
-    protected $regex = '/^([a-z0-9._-]{2,23})\@([a-z0-9-]{2,22}\.)+\w{2,5}$/i';
+    /**
+     * @var string
+     * https://tools.ietf.org/html/rfc5322#section-3.4.1
+     * https://tools.ietf.org/html/rfc5321#section-4.5.3
+     */
+    protected $regex = '/^([a-z0-9._-]{1,64})\@([a-z0-9-]{2,250}\.)+\w{2,5}$/i';
     
     public function __construct(){}
 }