These are some scripts I've used to parse unstructured output from GroupWise to get useful info. Parse-GWCheckLog.ps1 was the first one I wrote, and it might be a little fat. A good learning point though.

Parse-GWCheckLog.ps1

Set-Location C:\GWCheck

Get-ChildItem . | % {
    Get-Content $_.FullName -PipelineVariable log | % {
        if ($log -match "\S*Checking user =*\S.([^\s]+)|[\s]+(\d+).\S*kbytes*\S")
        {
            $matches[0] | Out-File -Append .\gwcheck.txt #"" | select @{n='User';e={$matches[1]}},@{n='Size';e={$matches[2]}}
        }
    }
}

$foo = Get-Content .\gwcheck.txt
$foo = $foo -replace "Checking user = ","" # leaves just the username
$foo = $foo -replace " kbytes","" # leaves just the size
$foo = $foo -replace '\s+','' # removes extra whitespace
$foo | Set-Content .\gwcheck.txt


$file = Get-Content .\gwcheck.txt
for($i = 0; $i -lt $file.Count; $i++)
{
    $line = $file[$i]
    if ($line.StartsWith('0') -or 
        $line.StartsWith('1') -or 
        $line.StartsWith('2') -or
        $line.StartsWith('3') -or
        $line.StartsWith('4') -or
        $line.StartsWith('5') -or
        $line.StartsWith('6') -or
        $line.StartsWith('7') -or
        $line.StartsWith('8') -or
        $line.StartsWith('9'))
    {
        Add-Content -Value "$($file[$i-1]),$($line)" -Path .\gwcheck-cleaned.txt
    }
}

Remove-Item .\gwcheck.txt

Parse-GWCheckLogins.ps1

Set-Location "$(Split-Path $PSCommandPath)"

# Audit report for user ([^\s]+\w)
# \sLast login time - (\d+\/\d+\/\d+)
# \sLast activity time - (\d+\/\d+\/\d+)
# \s(Limited|Full) client license (global)

Get-ChildItem . | % {
    Get-Content $_.FullName -PipelineVariable log | % {
        if ($log -match "(Audit report for user \(([^\s]+\w)|\sLast login time - (\d+\/\d+\/\d+)|\sLast activity time - (\d+\/\d+\/\d+)|\s(Limited|Full|inactive) client license)")
        {
            #$matches[0]#[0] | Out-File -Append .\gwcheck.txt
            #$matches[1]
            $matches[2] | Out-File -Append .\gwcheck.txt
            $matches[3] | Out-File -Append .\gwcheck.txt
            $matches[4] | Out-File -Append .\gwcheck.txt
            $matches[5] | Out-File -Append .\gwcheck.txt
        }
    }
}

$file = Get-Content .\gwcheck.txt
Add-Content -Value "Username,Last Login,Last Activity,License" -Path .\gwusers.csv
while ($file.Length -ge 4)
{
    Add-Content -Value "$($file[0]),$($file[1]),$($file[2]),$($file[3])" -Path .\gwusers.csv
    $file = $file[4..$($file.Length)]
}

Remove-Item .\gwcheck.txt