POWERSHELL - Output A Section of the Container/OU of AD-User Account's DistinguishedName - powershell

Question

I was voluntold to learn powershell about a week ago, and learned a lot from here.
I was unable to find a method that worked for me so now I am posting my first question.
I am looking to output under the OU column, not the full DistinguishedName, but a piece of it only.
How would I assign specific part of the DistinguishedName to the OU?
Instead of "CN=,OU=,DC=*", I would only want "(Name of OU) under (Name of Parent OU)"
Input
$ADExtProps =
#(
'Enabled',
'SamAccountName',
'OU'
)
Get-ADUser -Filter * -SearchBase $TestOU -Properties $ADExtProps
Format-Table $ADExtProps -AutoSize -Wrap
Output
Enabled SamAccountName OU
------- -------------- --
True testuser04 {}
True testuser05 {}
True testuser01 {}
True testuser02 {}
True testuser03 {}
True testuser06 {}
True testuser07 {}
True testuser08 {}
True testuser09 {}
False testuser10 {}
Thank you!
How would I assign specific part of the DistinguishedName to the OU?
Instead of "CN=,OU=,DC=*", I would only want "(Name of OU) under (Name of Parent OU)"

Answer 1

It could be done with regex extracting the OU name from the user's DistinguishedName however for the sake of not overcomplicating it, you can first query all OUs using Get-ADOrganizationalUnit then those objects already have the OU .Name which you can use to construct your output:
Get-ADOrganizationalUnit -Filter * | ForEach-Object {
$ouName = $_.Name
Get-ADUser -Filter * -SearchBase $_.DistinguishedName -SearchScope OneLevel |
Select-Object Enabled, SamAccountName, #{N='OU'; E={ $ouName }}
}
If you want to extract the OU common name using regex the following should work:
$TestOU = 'OU=someOU,DC=someDomain,DC=com'
$re = [regex] '(?<=OU=).+?(?<!\\)(?=,)'
Get-ADUser -Filter * -SearchBase $TestOU |
Select-Object Enabled, SamAccountName, #{N='OU'; E={ $re.Match($_.DistinguishedName).Value }}