Código PHP:
$foo = '
[cod]
class Stan{
public static void main(String args[]){
System.out.println("Hello world.");
}
}
[/cod]
';
$search = preg_match("/\[cod\](.*?)\[\/cod\]/si", $foo, $match);
$result = '<pre>' . $match[1] . '</pre>';
echo $result;
saludos capo