Get security groups members Domain\Username - powershell

Question

I have script that get all members of security groups across domains and export to CSV file in this format: Name, username, security group. But I want to add another row for the domain so format will look like this: domain\username, name, security group.
I could get the DN but I am only interested in just domain\username. I search around in the internet and I couldn't find anything and I am not sure if this even possible
$objForest = [System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest() $DomainList = #($objForest.Domains | Select-Object Name) $Domains = $DomainList | foreach {$_.Name}
$Groups = Import-Csv C:\ad.csv
$Table = #()
$Record = #{ "Group Name" = "" "Name" = "" "Username" = "" }
Foreach ($Group in $Groups) {
$Arrayofmembers = Get-ADGroupMember -identity $Group.groupad
-recursive -Server $Domain | select name,samaccountname
foreach ($Member in $Arrayofmembers) {
$Record."Group Name" = $Group.ad
$Record."Name" = $Member.name
$Record."UserName" = $Member.samaccountname
$objRecord = New-Object PSObject -property $Record
$Table += $objrecord
}
}
$Table | export-csv "C:\SecurityGroups3.csv" -NoTypeInformation

Answer 1

As Bum mentioned, you can use a regex to get the DC and combine it with the username:
$username = 'Michael'
$distinguishedName = 'CN=Domain Admins,CN=Users,DC=Fabrikam,DC=com'
$dc = [regex]::Match($distinguishedName, 'DC=([^,|$]+)').Groups[1].Value
$domainuser = '{0}\{1}' -f $dc, $username
Output of $domainuser:
$domainuser
Fabrikam\Michael