Applying a regex group capture in overall select-object expression

I am trying to parse some xml log entries and export the data as rows in a CSV file. The format of the input file looks like:


The Messages envelope contains a couple of thousands of Message children.

I am trying to extract the values of two attributes in their raw form and for the third attribute I want to apply a regular expression that captures a group and retain the group match. E.g. The custom object I would like to end up in the end should have attributes “value1”, “value2”, and Regex group match of “value3”.

What I have at the moment is

[xml]$results = get-content log_messages.log
$results.LogMessages.LogMessage | Where-Object {$_.messageID -like "S6F*"} |
    Select-Object -Property time,message,'#cdata-section' |
    Export-Csv parse_results.csv -Delimiter "," -NoTypeInformation

This yields a csv file with three columns, one for each property. What I really need is that the third column be the capture group applied on the value in ‘#cdata-section’. How do I apply the capture group in the overall query?

I am a complete beginner and I thank you in advance for your time.

XML can’t be pasted here; you’ll need to put it into a Gist and include the Gist URL here.

Well, without being able to see the sample data this can’t be exact, but in general, you can use a calculated property with Select-Object to do your RegEx on ‘#cdata-section’. It could look something like this.

[xml]$results = get-content log_messages.log
$results.LogMessages.LogMessage |
Where-Object {$_.messageID -like "S6F*"} |
Select-Object -Property time,message,@{Label = 'Value3'; Expression = {[regex]::Match($_.'#cdata-section','pat(t.*)ern').Groups[1].value}} |
Export-Csv parse_results.csv -Delimiter "," -NoTypeInformation