$accountnames=foreach( $line in (net user) -split "`n"){if($line -ne "" -and  $line -notlike 'User accounts*' -and  $line -notlike '---------*' -and  $line -notlike 'The command completed*' ){ Write-Output $line}}

$accountnames=$accountnames -replace("`n|`r|\s+", ",") -split(",")
$account_localgroups=foreach($account in $accountnames){if($account -ne ""){foreach($line in (net user $account)){if($line -like "Local Group Memberships*"){write-output "$account=$line`n".replace("\s+", " ").replace("*", "").replace("Local Group Memberships", "")}}}}

write-output $account_localgroups|ConvertFrom-StringData