Update quick launch links using PowerShell

 Hi All,

Got a new requirment to change quick launch links of the a website.
Below is powershell for it.

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
$FindString="url you want to update comes here"
$ReplaceString="new url here"
$SPWeb = Get-SPWeb "http://dev-test/"  ## website url here
$SPWeb.Navigation.QuickLaunch | ForEach-Object {
    if($_.Url -match $FindString){
        $linkUrl = $_.Url
        Write-Host "Updating $linkUrl with new URL"
        $_.Url = $_.Url.Replace($FindString,$ReplaceString)
        $_.Update()
    }
    $_.Children | ForEach-Object {
        if($_.Url -match $FindString){
            $linkUrl = $_.Url
            Write-Host "Updating $linkUrl with new URL"
            $_.Url = $_.Url.Replace($FindString,$ReplaceString)
            $_.Update()
        }
    }
}
$SPWeb.Dispose()