Cyrillic name

This method validates a name written in Cyrillic:

    /**
    * Check if the given name is writen in Cyrillic
    * Intervals, "-" and "–" symbols are also allwoed.
    * @param string $name - The name that will be checked.
    * @result boolean
    */
    public function is_cyrillic_name($name)
    {
        $expr = '/^[\-\–\p{Cyrillic}\s]+$/u';
        if(preg_match($expr, $name)) {
            return true;
        }
        return false;
    }