diff --git a/register.php b/register.php
index ec307e7..a94b9f8 100644
--- a/register.php
+++ b/register.php
@@ -7,7 +7,7 @@
  */
 
     require_once('includes.inc.php');
-    define('PATTERN', '^[a-zA-Z0-9 ]{6,20}$');
+    define('PATTERN', '/^[a-zA-Z0-9 ]{6,20}$/');
     $data = null;
     $error = 0;
     $name = $_GET['name'];