fixed user add

src/Auth/Business/LuticateUsersBusiness.php

@@ -137,7 +137,7 @@ class LuticateUsersBusiness extends LuBusiness {
         $hash = self::hashPassword($password);
         if (filter_var($username, FILTER_VALIDATE_EMAIL))
             self::badInput("Username can not be an email");
-        if (!preg_match("/^[A-Za-z0-9\\-_\\.]$/", $username)) {
+        if (!preg_match("/^[A-Za-z0-9\\-_\\.]+$/", $username)) {
             self::badInput("Username can only contain letters (A-Z a-z), numbers (0-9), hyphen (-), underscore (_) and dot (.)");
         }
         if (!filter_var($email, FILTER_VALIDATE_EMAIL))