Bulk download files from a url by specifying a wildcard and numeric range

DownloadAllByNumber.ps1

$sourcePattern = "http://something.com/somepath/somefile*.jpg"
$targetDir = "c:\downloads" 
$count = 256
New-Item -Path $targetDir -ItemType Directory -Force

for ($i=1; $i -le $count; $i++) {
    $source = $sourcePattern.Replace("*", $i)
    $parts = $source.Split('/')
    $target = Join-Path $targetDir $parts[$parts.Length - 1]
    echo "Downloading $source to $target"
    (New-Object System.Net.WebClient).DownloadFileAsync($source, $target)
}