Import-Module ActiveDirectory
While (($user = Read-Host "Username (leave blank to exist)") -ne "") {
    $groupfilter = Read-Host "Group name must contain (leave blank for all)"
    $groupadd = Read-Host "Add user to group (leave blank to not attempt add)"
    If ($groupadd -ne "") {
        Write-Host ""
        Try {
            Add-ADGroupMember -Identity $groupadd -Members $user
            Write-Host $user "successfully added to" $groupadd
        }
        Catch {
            Write-Host $Error
        }
    }
    $groups = Get-ADPrincipalGroupMembership $user | Sort Name
    Write-Host ""
    Write-Host "Groups added within the last couple minutes may not list."
    Write-Host ""
    ForEach ($group in $groups) {
        If($group.Name -match $groupfilter) {Write-Host $group.Name}
    }
    Write-Host ""
}