diff --git a/config/config.php b/config/config.php
index 2d732e4b59..183c2b2f9b 100644
--- a/config/config.php
+++ b/config/config.php
@@ -33,6 +33,7 @@ $config->methodVar   = 'f';               // requestType=GET: the method var nam
 $config->viewVar     = 't';               // requestType=GET: the view var name.
 $config->sessionVar  = 'sid';             // requestType=GET: the session var name.
 $config->allowedTags = '<p><span><h1><h2><h3><h4><h5><em><u><strong><br><ol><ul><li><img><a><b><font><hr><pre><div><table><td><th><tr><tbody><embed><style>';
+$config->accountRule = '|^[a-zA-Z0-9_]{1}[a-zA-Z0-9_\.]{1,}[a-zA-Z0-9_]{1}$|';
 
 /* Supported views. */
 $config->views  = ',html,json,mhtml,'; 
diff --git a/lib/filter/filter.class.php b/lib/filter/filter.class.php
index 9557a585fa..eb942bf3de 100755
--- a/lib/filter/filter.class.php
+++ b/lib/filter/filter.class.php
@@ -213,7 +213,8 @@ class validater
      */
     public static function checkAccount($var)
     {
-        return self::checkREG($var, '|^[a-zA-Z0-9_]{1}[a-zA-Z0-9_\.]{1,}[a-zA-Z0-9_]{1}$|');
+        global $config;
+        return self::checkREG($var, $config->accountRule);
     }
 
     /**