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# 設置NuGet包列表的URL
$packageName = "Newtonsoft.Json"
$targetHttp = "https://www.nuget.org/packages/"
$targetUrl = "{0}{1}" -f $targetHttp, $packageName

# 設置保存已下載包的目錄
$outputDirectory = "D:\nuget_packages"
if (-not (Test-Path $outputDirectory)) {
    New-Item -Path $outputDirectory -ItemType Directory
}

# 定義下載前綴
$httpPrefix = "https://www.nuget.org/api/v2/package/"
# 下載html文件內容
$htmlContent = Invoke-WebRequest -Uri $targetUrl -UseBasicParsing | Select-Object -ExpandProperty Content
# 匹配標簽
$pattern = "<.*?>"
$matches = [regex]::Matches($htmlContent, $pattern)

foreach ($match in $matches) {
　　$tag = $match.Value
　　# 獲取a標簽
　　if ($tag -like "<a href=*") {
　　　　Write-Host $tag
　　}
}

<a href="#" id="skipToContent" class="showOnFocus" title="Skip To Content">
...
<a href="/packages/System.Xml.XmlDocument/">
<a href="/packages/Newtonsoft.Json/13.0.3" title="13.0.3">
...
<a href="/packages/Newtonsoft.Json/3.5.8" title="3.5.8">
<a href="/stats/packages/Newtonsoft.Json?groupby=Version" title="Package Statistics">
...
<a href="/packages/Newtonsoft.Json/13.0.3/ReportAbuse" title="Report the package as abusive">
<a href="/packages/Newtonsoft.Json/13.0.3/ContactOwners" title="Ask the package owners a question">
...

# 獲取含有title的a標簽
if ($tag -like "*title=*") {
  Write-Host $tag        
}

<a href="#" id="skipToContent" class="showOnFocus" title="Skip To Content">
<a href="/packages/Newtonsoft.Json/13.0.3" title="13.0.3">
...
<a href="/packages/Newtonsoft.Json/3.5.8" title="3.5.8">
<a href="/stats/packages/Newtonsoft.Json?groupby=Version" title="Package Statistics">
<a href="https://www.newtonsoft.com/json" data-track="outbound-project-url" title="Visit the project site to learn more about this package" rel="nofollow">
...
<a href="/packages/Newtonsoft.Json/13.0.3/ReportAbuse" title="Report the package as abusive">
<a href="/packages/Newtonsoft.Json/13.0.3/ContactOwners" title="Ask the package owners a question">
<a href="/packages?q=Tags%3A%22json%22" title="Search for json" class="tag">

# 截取href的內容
$substr = $tag.Substring(9)
if ($substr -like "/packages/*") {
    Write-Host $substr
}

/packages/Newtonsoft.Json/13.0.3" title="13.0.3">
...
/packages/Newtonsoft.Json/3.5.8" title="3.5.8">
/packages/Newtonsoft.Json/13.0.3/ReportAbuse" title="Report the package as abusive">
/packages/Newtonsoft.Json/13.0.3/ContactOwners" title="Ask the package owners a question">

# 查找第一個雙引號的位置
$index = $substr.IndexOf('"')
# 獲取部分/packages/Newtonsoft.Json/13.0.3
$substr = $substr.Substring(0,$index)

# 排除報告濫用a標簽
if ($substr -notlike "*/ReportAbuse") {
　　# 排除聯系作者a標簽
　　if ($substr -notlike "*/ContactOwners") {
　　　　# 匹配版本
　　　　$endIndex = $substr.LastIndexOf('/')
　　　　$startPackageIndex = $endIndex + 1
　　　　$packageVersion = $substr.Substring($startPackageIndex)
　　}
}

# 下載地址nupkg
$packageUrl = "{0}{1}/{2}" -f $httpPrefix,$packageName,$packageVersion
# 生成保存文件的路徑
$packageFile = Join-Path -Path $outputDirectory -ChildPath "$packageName.$packageVersion.nupkg"
# 下載 .nupkg 文件
Write-Host "Downloading $packageName version $packageVersion from $packageUrl"
Invoke-WebRequest -Uri $packageUrl -OutFile $packageFile