Find users from foreign domains in a Active Directory group and output them to CSV

find-fsps-adgroup.ps1

#Find users from foreign domains in a Active Directory group and output them to CSV
$group=get-adgroup "mygroup" -Properties member
$domainController="mydc.company.loc"
$fsps = $group.member | where {$_ -like "*foreign*"} 
$outputUsers = @()
foreach ($fsp in $fsps) {
    $found = $fsp -match 'S-\d-\d-\d+-\d+-\d+-\d+-\w+'
    if ($found) {
        $usr = get-aduser $matches[0] -server $domainController -Properties displayname, useraccountcontrol, description, mail | select -Property samaccountname, displayname, useraccountcontrol, description, mail
        $outputUsers += $usr
    }
}
$outputUsers | export-csv -Path "c:\temp\fsp-general.csv"