自動全抓

$wc = New-Object system.net.webclient

$page = $wc.DownloadString("http://www.aisowhat.com/mathematics/math-dsp-download")

$REGEX = [regex] "<td class=`"td-file`">(?<NM>.*\.flv).*href=`"(?<URL>[^`"]*)`""

$mes = $REGEX.Matches($page) 

$MES | %{
 $wc.DownloadFile("http://www.aisowhat.com" + $_.Groups["URL"], "C:\" + $_.Groups["NM"])
}