jrv - I believe that the OP is looking to get the output one level higher.

C:\ClusterStorage\Volume1 vs C:\ClusterStorage\Volume1\CSV-VM

That's what the original code spits out at least.

Another is:

$s.Remove($s.LastIndexOf('\'))

I'm trying to capture before the third occurence. In this case 'C:\ClusterStorage\Volume1'

I'm trying to capture before the third occurence. In this case 'C:\ClusterStorage\Volume1'

See my post above, that'll get you what you're after.

I would use either split or Split-Path

Split-Path (Split-Path $s)

There is also another construct which can be useful;

([io.directoryinfo]$s).Parent.Parent.Fullname

An similarly with FileInfoo.

 ([io.fileinfo]$s).Directory.Parent.Fullname

THe simplest and eeasiest to remember is this:

Split-Path (Split-Path $s)

Just do a walkback foor ass many parents as needed.

Split-Path (Split-Path (Split-Path $s))

This will walk-back one more folder.

Mike's method is also very easy to use.

$mainstring   = "C:\ClusterStorage\Volume1\CSV-VM\CSV-VM-VHD.vhdx"
$s = $mainstring.split('\')
$subsetstring = $($s[0],$s[1],$s[2]) -join '\'

Write-Host $subsetstring

Oh!  I see!

Like this:

$s='C:\ClusterStorage\Volume1\CSV-VM\CSV-VM-VHD.vhdx'.Split('\')
[string]::Join('\',$s[0..2])

The equivalent is:

Get-Aduser -Filter '-not (employeeType -eq "terminated")'

$s='C:\ClusterStorage\Volume1\CSV-VM\CSV-VM-VHD.vhdx'
[string]::Join($s[2],$s.Split($($s[2]))[0..2])

• Edited by LarryWeiss 2 hours 38 minutes ago

capture the substring before the third occurrence of a slash (\) character

$s = 'C:\ClusterStorage\Volume1\CSV-VM\CSV-VM-VHD.vhdx'
$d = '\'
$n = 3
[string]::Join($d,$s.Split($d)[0..$($n-1)])

• Edited by LarryWeiss 18 hours 38 minutes ago

capture the substring before the third occurrence of a slash (\) character

$s = 'C:\ClusterStorage\Volume1\CSV-VM\CSV-VM-VHD.vhdx'
$d = '\'
$n = 3
[string]::Join($d,$s.Split($d)[0..$($n-1)])

• Edited by LarryWeiss Tuesday, July 28, 2015 12:32 PM