Active Directory (AD) Get all Groups and its members

$ExportPath = 'c:\Users\Adminstrator\ad-export'

$groupNames = (Get-ADGroup -Filter * -SearchBase "OU=Groups,OU=Users,DC=local,DC=example,DC=com")

foreach ($group in $groupNames) { 
    $fileName = (Get-ADGroup $group | Select-Object SamAccountName | Out-String -Stream)
    $fileName2 = (
        $fileName.
            replace('@{Name=','').
            replace('}','').
            replace('\','').
            Replace('SamAccountName','').
            Replace('----------','').
            replace('\\r\\n','').
            replace('\r\n','').
            replace('----','').
            replace('  ','')
    )
    $path = $ExportPath + "\" + $fileName2 + ".csv"
    Get-ADGroup $group | Get-ADGroupMember -Recursive | Get-ADUser -Properties * | Select SamAccountName, Surname, GivenName, Title, Mail | Export-Csv -NoType -Encoding UTF8 -Delimiter ";" $path
}