Reverse-DelimitedString.ps1

param (
    [Parameter(Mandatory=$True)]
    [System.Array]$StringList,
    [Parameter(Mandatory=$False)]
    [System.Array]$Delimiter = '.'
)

$StringListReversed = @()

foreach ($String in $StringList) {
    $StringSplitted = $String.Split($Delimiter)
    $Counter = $StringSplitted.Count
    $StringReversed = ''
    while ($Counter -gt 0) {
        $StringReversed += $StringSplitted[$Counter-1]
        $Counter = $Counter-1
        if ($Counter -gt 0) {
            $StringReversed += $Delimiter
        }
    }
    $StringListReversed += $StringReversed
}

return $StringListReversed