Powershell Filter Eventlog Message String after Account Name

Dear Community

I am trying to filter a string from an eventlog message with powershell and write it into a log file.  
Actually I use the following command:
get-winevent -FilterHashtable @{Logname='Security';ID=4740}  -MaxEvents 1 | FL

I attached the output for the command above (Filter-accound-name.png). In that output I tagged a string with yellow. Is is possible to extract that only that string, which is the account name, and set it into a variable?

There are commands like select-string or findstr, but I was not able to filter only the account name with these commands.

Thank you in advance for your help

Best regards
SilvanSystem EngineerAsked:
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The short version (relies on the target user name being the first property of the event data):
$TargetUserName = (Get-WinEvent -FilterHashtable @{Logname='Security'; ID=4740} -MaxEvents 1).Properties[0].Value

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Or (more properly solved by using the event xml) if you want to retrieve all of the properties and convert them to a custom object, you can use something like this:
$Event = Get-WinEvent -FilterHashtable @{Logname='Security'; ID=4740} -MaxEvents 1 |
	% {
		$Result = $_ | Select-Object -Property TimeCreated, ProviderName, Id
		([xml]$_.ToXml().Replace("xmlns=", "dummy=")).SelectNodes("/Event/EventData/Data") |
			% {
				Add-Member -InputObject $Result -MemberType "NoteProperty" -Name $_.Name -Value $_.InnerText
"TargetUserName: " + $Event.TargetUserName

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Working with the .Message property isn't really ideal, see 'Get-WinEvent does not return the content of the Event Message in V3 CTP2', https://connect.microsoft.com/PowerShell/feedback/details/716533/get-winevent-does-not-return-the-content-of-the-event-message-in-v3-ctp2

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SilvanSystem EngineerAuthor Commented:
Great it works as expected. But I still have a question, how did you know that the user name is stored in "Properties[0]"?
Using the second-most important PS command after Get-Help (namely Get-Member), and some educated guessing.
For speed reasons, assign the result of your query to a variable:
$e = Get-WinEvent -FilterHashtable @{Logname='Security'; ID=4740} -MaxEvents 1

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Then examine that object (gm is an alias for Get-Member):
$e | gm

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You'll get a bunch of methods and properties, and the "Properties" property looks interesting. You check it out

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and you find the properties as listed in the "Friendly View" of the event viewer's details.
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