diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index bc811cc75b..5914831539 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -3456,7 +3456,7 @@ function get_preg_expression($mode)
 		case 'email':
 			// Regex written by James Watts and Francisco Jose Martin Moreno
 			// http://fightingforalostcause.net/misc/2006/compare-email-regex.php
-			return '([\w\!\#$\%\&\'\*\+\-\/\=\?\^\`{\|\}\~]+\.)*(?:[\w\!\#$\%\'\*\+\-\/\=\?\^\`{\|\}\~]|&)+@((((([a-z0-9]{1}[a-z0-9\-]{0,62}[a-z0-9]{1})|[a-z])\.)+[a-z]{2,6})|(\d{1,3}\.){3}\d{1,3}(\:\d{1,5})?)';
+			return '([\w\!\#$\%\&\'\*\+\-\/\=\?\^\`{\|\}\~]+\.)*(?:[\w\!\#$\%\'\*\+\-\/\=\?\^\`{\|\}\~]|&)+@((((([a-z0-9]{1}[a-z0-9\-]{0,62}[a-z0-9]{1})|[a-z])\.)+[a-z]{2,63})|(\d{1,3}\.){3}\d{1,3}(\:\d{1,5})?)';
 		break;
 
 		case 'bbcode_htm':
diff --git a/tests/regex/email_test.php b/tests/regex/email_test.php
index 17f93259c3..b4ea5b23aa 100644
--- a/tests/regex/email_test.php
+++ b/tests/regex/email_test.php
@@ -28,6 +28,8 @@ class phpbb_regex_email_test extends phpbb_test_case
 			array('alice_foo@bar.phpbb.com'),
 			array('alice+tag@foo.phpbb.com'),
 			array('alice&tag@foo.phpbb.com'),
+			array('alice@phpbb.australia'),
+			array('alice@phpbb.topZlevelZdomainZnamesZcanZbeZupZtoZsixtyZthreeZcharactersZlong'),
 
 			//array('"John Doe"@example.com'),
 			//array('Alice@[192.168.2.1]'),		// IPv4
@@ -96,6 +98,7 @@ class phpbb_regex_email_test extends phpbb_test_case
 			array('! "#$%(),/;<>[]`|@invalidCharsInLocal.org'),
 			array('invalidCharsInDomain@! "#$%(),/;<>_[]`|.org'),
 			array('local@SecondLevelDomainNamesAreInvalidIfTheyAreLongerThan64Charactersss.org'),
+			array('alice@phpbb.topZlevelZdomainZnamesZcanZbeZupZtoZsixtyZthreeZcharactersZlongZ'),
 		);
 	}