PS script to switch between Windows and Linux containers from the command line

Docker-switcher.ps1

param (
    [Parameter(Mandatory=$true)][ValidateSet("windows","linux")] [string]$targetDaemon )

    $daemon = "*"+$targetDaemon.ToLower()+"*";

    $dockerver = Docker version | Select -Last 2
    #$dockerver = Docker version
    if ($dockerver -like $daemon)
        {
            echo "Daemon already set to:"$targetDaemon    
        }
    else
        {
        echo "Switching daemon...";
        & "c:\program files\docker\docker\dockercli" -SwitchDaemon
        echo "Daemon switched!"
        }

My regex skills failed me badly :'(

docker version -f '{{.Server.Os}}'