测试路径：路径中的非法字符

我正在尝试使用powershell从channel9下载视频系列，但是我在第一个文件中遇到此错误，我认为它是竖线字符，但即使使用replace语句也无法正常工作

 function Get-Media
{
    [CmdletBinding()]
    param
    (
        [Object]
        $url,
        [Object]
        $title,
        [Object]
        $path
    )

    $u = New-Object System.Uri($url)
    $name = $title
    $extension = [System.IO.Path]::GetExtension($u.Segments[-1])
    $fileName = $name + $extension

    $fileName = $fileName -replace "’", ''
    $fileName = $fileName -replace "\?", ''
    $fileName = $fileName -replace ":", ''
    $fileName = $fileName -replace '/', ''
    $fileName = $fileName -replace ",", ''
    $fileName = $fileName -replace '"', ''
    $fileName = $fileName -replace '|', ''
    $fileName = $fileName -replace '\#', ''
    $fileName = $fileName -replace '-', ''

    $fileName

    if (Test-Path($fileName)) {
        Write-Host 'Skipping file, already downloaded' -ForegroundColor Yellow
    }
    else
    {
        Invoke-WebRequest $url -OutFile (Join-Path -Path $path -ChildPath $fileName)
    }
}

function Get-VideosFromFeed
{
    [CmdletBinding()]
    param
    (
        [Object]
        $feedUrl,
        [Object]
        $folder,
        [Object]
        $path
    )

    $feed=[xml](New-Object System.Net.WebClient).DownloadString($feedUrl)

    $downloadPath = (Join-Path -Path $path -ChildPath $folder)

    if (Test-Path($downloadPath)) {
        Write-Host 'Skipping folder, already exists' -ForegroundColor Yellow
    }
    else
    {
        New-Item -Path $downloadPath -ItemType directory -WarningAction SilentlyContinue
    }

    foreach($i in $feed.rss.channel.item) {
        foreach($m in $i.group){
            foreach($u in $m.content `
                    | Where-Object { `
                            $_.url -like '*mid.mp4' `
                         } | Select-Object -Property @{Name='url'; Expression = {$_.url}}, `
                                                     @{Name='title'; Expression = {$i.title}})
            {
                Get-Media -url $u.url -title $u.title -path $downloadPath
            }
        }
    }
}

$physicalPath = "D:\Videos\Series"

Get-VideosFromFeed -feedUrl 'https://channel9.msdn.com/Blogs/azurestack/feed/mp4high'                                                                          -path $physicalPath -folder 'azurestack'