Validate all image URLs in a WordPress blog export

Check-ImageUrls.ps1

# Export your WordPress blog to an XML file. Then:
$xmlFile = "./export/sqlsundaycom.wordpress.2021-05-23.001.xml"

$matches = Select-String -Path $xmlFile -Pattern '(?<=src\=\")http(.*?)(?=\")' -AllMatches `
    | % { $_.Matches }
    | % { $_.Value }
    | Sort-Object -Unique

foreach ($url in $matches) {
    #$url

    $res = Invoke-WebRequest -Uri $url -Method "HEAD" -SkipHttpErrorCheck
    if ($res.StatusCode -ne 200) {
        Write-Error ("ERROR: Status "+$res.StatusCode+": "+$url)
    }
}