How to search array of objects contains an item in another array?

Use to -notin or -notcontains operator for that.

$importvms | ?{$_.Name -notin $vms.name} | %{ Do Stuff }

Alias ? used for Where, and % used for ForEach.

Ok, it that doesn't work we can try building a regex match string out of your array of current VM names, and matching each imported VM against that to see if it already exists. Try this script:

Connect-VIServer -Server vCenter -Protocol https -Force | out-null$importVms = Import-Csv vCenterVMs.csv$VMHost = "esxi"$currentVms = Get-VMWrite-Host "Current registered VMs" -ForeGroundColor Cyan$currentVMsWrite-Host "Saved VMs to import" -ForeGroundColor Yellow$importVms$registered = @()Write-Host "Importing VMs..." -ForeGroundColor White#$importVms | ?{$_.Name -notcontains $currentVms}$VMNameFilter = "($(($currentVms|%{[RegEx]::Escape($_.Name)}) -join "|"))"foreach ($vm in $importVms) {    if (! $vm.Name -match $VMNameFilter) {        Write-Host "Importing $($vm.Name)"        # put in a try block here        $registeredVM = New-VM -VMFilePath $vm.VmPathName -VMHost $VMHost -Location $vm.Location        $registeredList += $registeredVM.Name    }}$registeredListDisconnect-VIServer -Server * -Confirm:$false

Another way, which would be better used in a script:

Foreach ($ImportVm in $ImportVms.name) { if ($vms.name -notcontains $ImportVm) {DO STUFF }}

The Foreach is looping through the VM names in the array $ImportVMs, putting each individual VM name from $ImportVMs in the variable $ImportVM at each loop.

Then , the "if" statement checks if the array of names in $vms doesn't contain the $ImportVM currently in the loop.If this "if" statement evaluates to true, then the script will do whatever is inside the { }.I just put { DO STUFF } here, because you didn't mention what you want to do with these VMs.