Validation data - question

Hi guys, Does anyone know how to write validation for data witch contains letters such as šđčćž (those are Serbian letters)? Here is part of my code where it does validation: $admins_validation = array('name' => '/^[[:alnum:][:punct:][:space:]]{1,50}$/', 'surname' => '/^[[:alnum:][:punct:][:space:]]{1,50}$/', 'email' => '/^[A-Za-z0-9]+((\.|-|_)[A-Za-z0-9]+)*@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/', ...... ); So, for example if someone enters name Dušan it won't except it. -- made by Dusan