Can't exclude a directory pattern recursively

I’m trying to get child items of a folder recursively. However the folder contains noise files and folder (actually, this is a Visual Studio project folder).

Here what I have:

$root = Get-Item C:ProjectsMyProject

$allItems =  Get-ChildItem $root -Recurse -exclude "**pkgobj*"

However, $allItems still contains files and folder matching the paths.

What I did wrong?

To be more precise, I want to get both folders and files, but not the specified folder, and any of its descendant.

I also tried:

foreach($item in $allItems){
    if($item.FullName -notmatch "pkgobj") {
        Write-Host -ForegroundColor Green $item.FullName.Replace($root,'')

    }
}

But no more success

$root = "C:ProjectsMyProject"
$allitems = Get-ChildItem $root -Recurse | Where {$_.FullName -notlike "*pkgobj*"} 

Get-childitem -path c:windows -exclude 'temp' | get-childitem -recurse