diff --git a/interface/web/admin/form/system_config.tform.php b/interface/web/admin/form/system_config.tform.php
index 60545342264fc65d72c11c547e9608c92fa43dc2..ce4a0cbfab29b453937ba700720d7b1dad6c80fa 100644
--- a/interface/web/admin/form/system_config.tform.php
+++ b/interface/web/admin/form/system_config.tform.php
@@ -62,7 +62,7 @@ $form["tabs"]['sites'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',
 			'validators' => array ( 0 => array ( 'type' => 'REGEX',
-					'regex' => '/^[a-zA-Z0-0\-\_\[\]]{0,50}$/',
+					'regex' => '/^[a-zA-Z0-9\-\_\[\]]{0,50}$/',
 					'errmsg'=> 'dbname_prefix_error_regex'),
 			),
 			'default' => '',
@@ -74,7 +74,7 @@ $form["tabs"]['sites'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',
 			'validators' => array ( 0 => array ( 'type' => 'REGEX',
-					'regex' => '/^[a-zA-Z0-0\-\_\[\]]{0,50}$/',
+					'regex' => '/^[a-zA-Z0-9\-\_\[\]]{0,50}$/',
 					'errmsg'=> 'dbuser_prefix_error_regex'),
 			),
 			'default' => '',
@@ -86,7 +86,7 @@ $form["tabs"]['sites'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',
 			'validators' => array ( 0 => array ( 'type' => 'REGEX',
-					'regex' => '/^[a-zA-Z0-0\-\_\[\]]{0,50}$/',
+					'regex' => '/^[a-zA-Z0-9\-\_\[\]]{0,50}$/',
 					'errmsg'=> 'ftpuser_prefix_error_regex'),
 			),
 			'default' => '',
@@ -98,7 +98,7 @@ $form["tabs"]['sites'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',
 			'validators' => array ( 0 => array ( 'type' => 'REGEX',
-					'regex' => '/^[a-zA-Z0-0\-\_\[\]]{0,50}$/',
+					'regex' => '/^[a-zA-Z0-9\-\_\[\]]{0,50}$/',
 					'errmsg'=> 'shelluser_prefix_error_regex'),
 			),
 			'default' => '',
@@ -110,7 +110,7 @@ $form["tabs"]['sites'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',
 			'validators' => array ( 0 => array ( 'type' => 'REGEX',
-					'regex' => '/^[a-zA-Z0-0\-\_\[\]]{0,50}$/',
+					'regex' => '/^[a-zA-Z0-9\-\_\[\]]{0,50}$/',
 					'errmsg'=> 'webdavuser_prefix_error_regex'),
 			),
 			'default' => '',