Finding users who logged onto workstations

The following is my attempt to discover the workstations in a domain and find out which user was the last person on that workstation.  My trouble is getting the userID from the line which has "Account Name: ".  I saw some posting using Regex which looks like hieroglyphics to me.  Anyway, any suggestions to advance this would be appreciated.

#get non-server class computers from domain

$wks=Get-ADComputer-Filter { OperatingSystem-NotLike'*Server*' } -PropertiesOperatingSystem

#Create an array to stick the results

 $info =@() 

 foreach ($pcin$wks) {

$pcname

=$pc.name

$lastuserevent

$lastuser=$lastuserevent.message|select-string -pattern "Account Name:" -Context 1,1

 $info+=$pcname,$lastuser

}

$info|Export-CSV "c:\scripts\PC2UserAssociation.csv" -NoTypeInformation

When I look into what is contained in $lastuserevent.message, I see the following:

 
An account was successfully logged on.
Subject:
 Security ID:  S-1-0-0
 Account Name:  -
 Account Domain:  -
 Logon ID:  0x0
Logon Type:   3
New Logon:
 Security ID:  S-1-5-21-1274253652-4404135117-2032146204-25962
 Account Name:  UserX
 Account Domain:  DomainX
 Logon ID:  0x4f45786
 Logon GUID:  {C89819D6-A100-1C04-6AF5-0BD956666D39}

I need to pick out UserX from $lastuserevent.message.  Any suggestions how?