Det imellem [hood] skal være highlight

hej jeg bruger denne function:

function tjek($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 );
}

og denne når jeg udskriver det
<?php print ($rowa["tekst"] == "") ? ("..") : (str_replace( array( "[hoode]", "[/hood]" ), array( "<div class=\"hood\">", "</div>" ), tjek( $rowa["tekst"] ) )); ?>


hvordan får jeg den til at blive hightlight inde i [hood]..[/hood] ?????