{
    local $/;
    open my $fh,'<',$html_file or die $!;
    my $content = <$fh>;
    close $fh<

    $content =~ s~(<!-- platzhalter -->)~$neues_html$1~;

    open my $wfh,'>',$html_file;
    print $wfh $content;
    close $wfh;
}