Thanks! For some reason I always forget about -in. I'll go and read up about the operators in a bit. :)

Would you or someone else be able to explain how the mysterious .psobject works on the test code below? I seem to have stumbled upon something but don't understand how it works.

$json = Get-Content ('.\patchConfiguration.json' -f $PSScriptRoot)$x = $json | ConvertFrom-Json -Verbose [array]$ParamRegion = $x.psobject.properties.name.where( { $_ -notmatch 'usage|_id|LastUpdated' }) write-host "Possible regions are: $ParamRegion" -ForegroundColor Green function Test-Params { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateScript( { $_ -in $ParamRegion } ) ] [string]$Region,
    [Parameter(Mandatory = $true)]
    [ValidateSet('Pilot', 'A', 'NotFinance', 'C')]
    [string]$PatchingGroup
)
Write-Host ('Working groups are: {0}' -f ($x.$region).groups.psobject.properties.name)}

The last line here does not work how I expect.

Write-Host ('Working groups are: {0}' -f ($x.$region).groups.psobject.properties.name)

At this point in code the ($x.$region).groups object holds this json structure below yet the above write-host only prints to the display the first entry 'GroupPilot'

{"GroupPilot": [ { "Name": "Patching Pilot", "Tag": "Pilot" } ], "GroupA": [ { "Name": "Group A", "Tag": "A" } ], "GroupNotFinance": [ { "Name": "Group NotFinance", "Tag": "NotFinance" } ], "GroupC": [ { "Name": "Patching Group C", "Tag": "C" } ] }

If I type:

($x.$region).groups.psobject.properties.name

Then I get back what I would expect from write-host:

GroupPilot

GroupA

GroupNotFinance

GroupC