Break up the isEmail validator, closes #152

Author: chriso

validator.js

@@ -35,11 +35,13 @@
 
     validator = { version: '4.0.4' };
 
-    var emailUser = /^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~])+)*)|"(\s*(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e])|(\\[\x01-\x09\x0b\x0c\x0d-\x7f])))*\s*")$/i;
+    var emailUserPart = /^[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~]+$/i;
+    var quotedEmailUser = /^([\s\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e]|(\\[\x01-\x09\x0b\x0c\x0d-\x7f]))*$/i;
 
-    var emailUserUtf8 = /^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|"(\s*(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*\s*")$/i;
+    var emailUserUtf8Part = /^[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+$/i;
+    var quotedEmailUserUtf8 = /^([\s\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|(\\[\x01-\x09\x0b\x0c\x0d-\x7f\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))*$/i;
 
-    var displayName = /^(?:[a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~\.]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(?:[a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~\.]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|\s)*<(.+)>$/i;
+    var displayName = /^[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~\.\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~\.\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF\s]*<(.+)>$/i;
 
     var creditCard = /^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})$/;
 
@@ -196,9 +198,24 @@
             return false;
         }
 
-        return options.allow_utf8_local_part ?
-            emailUserUtf8.test(user) :
-            emailUser.test(user);
+        if (user[0] === '"') {
+            user = user.slice(1, user.length - 1);
+            return options.allow_utf8_local_part ?
+                quotedEmailUserUtf8.test(user) :
+                quotedEmailUser.test(user);
+        }
+
+        var pattern = options.allow_utf8_local_part ?
+            emailUserUtf8Part : emailUserPart;
+
+        var user_parts = user.split('.');
+        for (var i = 0; i < user_parts.length; i++) {
+            if (!pattern.test(user_parts[i])) {
+                return false;
+            }
+        }
+
+        return true;
     };
 
     var default_url_options = {