Disable certain characters in usernames

[pachoofoosh]

To check that usernames only have letters, numbers, and spaces, find the usernamevalidate() function in classes/class_registervalidator.php and replace the function with this:

PHP Code:

protected function usernamevalidate($username = ""){
      // The username validator, note its a bit complicate here due to the different mechanism of username check for register and other validators
      $lang = Registry::get("lang");
      if(!$this->emptyvalidate($username)){
         $this->seterror("The field Username is Empty.");
         return FALSE;
      }
      if(preg_match('#^[A-Z0-9 ]+$#i', $username) == FALSE){
         $this->seterror("Usernames can only contain letters, numbers, and spaces.");
         return FALSE;
      }
      $username = (empty($username))?$this->value['username']:$username;      
      $userexist = $this->datavalidate("users", array("username"), "username = '{$username}'");
      if($userexist == TRUE){
         $this->seterror($lang->user);
         return FALSE;
      }
      else return TRUE;
  }