diff --git a/WEB/Config/Validation.php b/WEB/Config/Validation.php
index 16477f87..fe5aedfe 100644
--- a/WEB/Config/Validation.php
+++ b/WEB/Config/Validation.php
@@ -30,7 +30,7 @@ class Validation
         return true;
     }
     public function ValidateUsername(string $username) : bool{
-        if(!filter_var($username,FILTER_VALIDATE_REGEXP,array("options" => array( "regexp" => "^[^&=_'\-+;<>.]{1,18}$" ))))
+        if(!preg_match("/^[^&='\-\+;\.<>]{1,18}$/",$username))
         {
             return false;
         }