diff --git a/admin_phpsettings.php b/admin_phpsettings.php
index b86c9de3..f43ce116 100644
--- a/admin_phpsettings.php
+++ b/admin_phpsettings.php
@@ -417,7 +417,7 @@ if ($page == 'overview') {
 				$max_spare_servers = isset($_POST['max_spare_servers']) ? (int) $_POST['max_spare_servers'] : 0;
 				$max_requests = isset($_POST['max_requests']) ? (int) $_POST['max_requests'] : 0;
 				$idle_timeout = isset($_POST['idle_timeout']) ? (int) $_POST['idle_timeout'] : 0;
-				$limit_extensions = validate($_POST['limit_extensions'], 'limit_extensions', '^(\.[a-z]([a-z0-9]+)\ ?)+$');
+				$limit_extensions = validate($_POST['limit_extensions'], 'limit_extensions', '/^(\.[a-z]([a-z0-9]+)\ ?)+$/');
 				
 				if (strlen($description) == 0 || strlen($description) > 50) {
 					standard_error('descriptioninvalid');
@@ -546,7 +546,7 @@ if ($page == 'overview') {
 				$max_spare_servers = isset($_POST['max_spare_servers']) ? (int) $_POST['max_spare_servers'] : $result['max_spare_servers'];
 				$max_requests = isset($_POST['max_requests']) ? (int) $_POST['max_requests'] : $result['max_requests'];
 				$idle_timeout = isset($_POST['idle_timeout']) ? (int) $_POST['idle_timeout'] : $result['idle_timeout'];
-				$limit_extensions = validate($_POST['limit_extensions'], 'limit_extensions', '^(\.[a-z]([a-z0-9]+)\ ?)+$');
+				$limit_extensions = validate($_POST['limit_extensions'], 'limit_extensions', '/^(\.[a-z]([a-z0-9]+)\ ?)+$/');
 				
 				if (strlen($description) == 0 || strlen($description) > 50) {
 					standard_error('descriptioninvalid');