Tillade alle tags

Hvordan får jeg denne til at tillade alle tags?
fra 0-9, a-z alle speciel tegn ( /*-+\-: osv osv osv )

I denne kode

<?php
function udskriv($txt)
{
$txt = $txt;

    $code = "/\[(code|kode)\](.+?)\[\/(code|kode)\]/";
    $username = "[a-z0-9_\-]+";
    $password = "[a-z0-9_\-!#]+";
    $host = "[a-z0-9_\-]+\.[a-z0-9\-\.]+";
    $port = "\d{1,5}";
    $path = "\/[a-z0-9_\/\-\.\(\)\%]*";
    $querystr = "\?[a-z0-9_&=\-\.%\(\)]+";
    $proto = "(https?|ftp):\/\/";
    $url = "$host(:$port)?($path($querystr)?)?";
    $protodomain = "/$proto(($username(:$password)?@)?$url)/i";
    $domain = "/(^| )(www\.$url)/im";
    $protomail = "/mailto:($username@$host)/i";
    $mail = "/(^| )($username@$host)/im";
    $replacements = array(
            $protodomain => "<a href=\"\\0\" target=\"_blank\"><span class=\"link\">\\2</span></a>"
            ,$domain => "\\1<a href=\"http://\\2\" target=\"_blank\"><span class=\"link\">\\2</span></a>"
            ,$protomail => "<a href=\"\\0\"><span class=\"link\">\\1</span></a>"
            ,$mail => "\\1<a href=\"mailto:\\2\"><span class=\"link\">\\2</span></a>"
            ,$code => "<div class=\"kodeeksempel\">$2</div>"
        );
    return preg_replace( array_keys( $replacements ), array_values( $replacements ), $txt );
}
?>