PowerShell for Windows Admins

Jun 29 2015   9:12AM GMT

Parsing ipconfig /displaydns with regular expressions

Richard Siddaway Richard Siddaway Profile: Richard Siddaway


In yesterday’s post I used a series of split operations to parse the strings produced by ipconfig /displaydns

Regular expressions should give a more power full way to perform this task. Not being a big fan of regular expressions I tend not to use them but for the sake of experimentation I thought I’d try and figure out a set of regex to use.

This is as far as I’ve got:

$props = [ordered]@{
RecordName = “”
RecordType = “”
Section    = “”
TimeToLive = 0
DataLength = 0
Data       = “”

$recs = @()

$cache = ipconfig /displaydns
for($i=0; $i -le ($cache.Count -1); $i++) {
if ($cache[$i] -like ‘*Record Name*’){
$rec = New-Object -TypeName psobject -Property $props
$rec.RecordName = $cache[$i] -replace “(\s*\w*){2}(\s\.){5}(\s\:\s)”, “”
$rec.Section = $cache[$i+4] -replace “\s*\w*(\s\.){7}(\s\:\s)”, “”
$rec.TimeToLive = $cache[$i+2] -replace “(\s*\w*){3}\s(\s\.){4}(\s\:\s)”, “”
$rec.DataLength = $cache[$i+3] -replace “(\s*\w*){2}(\s\.){5}(\s\:\s)”, “”

$irec = ($cache[$i+5] -split “: “)
$rec.RecordType = ($irec[0].TrimStart() -split ‘ ‘)[0]
$rec.Data = $irec[1]

$recs += $rec
else {

$recs | Format-Table –AutoSize

I still need to work out how to process the data and record type using regular expressions.

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