det imllem [code] og [/code]

function tjek($txt)
{
$txt = str_replace("[code]", '<div class="kodeEks">', $txt);
$txt = str_replace("[kode]", '<div class="kodeEks">', $txt);
$txt = str_replace("[/code]", '</div>', $txt);
$txt = str_replace("[/kode]", '</div>', $txt);
    $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>"
        );
    return preg_replace( array_keys( $replacements ), array_values( $replacements ), $txt );
}

domaz.dk: hvad så hvis man kun skrive [code] og ikke afslutter den?
Dette er ikke testet, men hvad hvis du bruger denne?
---------------------------------
function tjek($txt)
{
    $txt = preg_replace("/\[kode\](.+?)\[\/kode\]/", '<div class=\"kodeEks\">$1</div>', $txt);
    $txt = preg_replace("/\[code\](.+?)\[\/code\]/", '<div class=\"kodeEks\">$1</div>', $txt);
    $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>"
        );
    return preg_replace( array_keys( $replacements ), array_values( $replacements ), $txt );
}

webstuff: har du selvf ret i... :) det var os bare en hurtig løsning...

har forenklet og rettet din lidt:

function tjek($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=\"kodeEks\">$2</div>"
        );
    return preg_replace( array_keys( $replacements ), array_values( $replacements ), $txt );
}

Helt i orden :)

tak for point :-)

jeps, takker..