use LWP::Simple;
$url = get("https://class.coursera.org/automata-002/lecture/index");
$link = '';
foreach (split /\n/, $url){
 if(/download\.mp4/){
        $_ =~m/href="(.+)"/; $link = $1;
 }
 if(/(Video \(MP4\) for )(.+)<\/div>/){
        print "downloading $2\n" if $1;
        $file = get($link);
        open FILE,'>'.$2.'.mp4' or die $!;
        print FILE $file;
        close FILE;
 }
}