使用PowerShell从HTML网站获取图像链接

我想批量下载一些图片库.这些图像是免费提供的,无需任何权限.我为我的生活无法让它发挥作用.这就是我到目前为止所拥有的. $pattern吐出的是整个HTML行,而不仅仅是图像链接.你有什么指示可以给我吗？循环设置为仅运行一次以进行测试.循环将遍历所有以数字方式组织的页面.

# Variables
$i=1        # Webpage Counter
$j=1        # Image Counter
$rootDir = "http://website.com/sport/galleries/"
$saveDir = "C:UsersuserDesktop"
$webpagetxt = "C:UsersuserDesktoppage.txt"
$links = "C:UsersuserDesktoplinks.txt"
$regex = "http://website.com/galleries/[0-9]*/[^.]*.JPG"

# Create folder to download to
#New-Item -Name SiouxSportsGalleries -ItemType directory

# Start Web Client
$client = New-Object System.Net.WebClient

# Main loop to get image links and download
    For($i=10; $i -le 10; $i++){

        # Download source code of the web page.
        $url = $rootDir+$i+'.htm'
        $webclient = new-object System.Net.WebClient
        $webpage = $webclient.DownloadString($url)
        $webpage > "$webpagetxt"

    # Parse web page and find image link.
       $pattern = Get-Content $webpagetxt | Select-String -pattern $regex -Allmatches
       echo "This is the link" $pattern
    #$pattern > $links

 }

Get-Content $webpagetxt | Select-String -pattern $regex -Allmatches | % { $_.Matches | % { $_.Value } }