Parse csv along comparing txt file lined and log lines not found - powershell

Question

As a continuation of a script I'm running, working on the following.
I have a CSV file that has formatted information, example as follows:
File named Import.csv:
Name,email,x,y,z
\I\RS\T\Name1\c\x,email#jksjks,d,f
\I\RS\T\Name2\d\f,email#jsshjs,d,f
...
This file is large.
I also have another file called Note.txt.
Name1
Name2
Name3
...
With help from #mathias-r-jessen
$Dir = PathToFile
$import = Import-Csv $Dir\import.csv
$NoteFile = "$Dir\Note.txt"
$Note = GC $NoteFile
$Import |Where-Object {$Note -contains $_.Name.Split('\')[4]} |Export-Csv "$Dir\Result.csv" -NoTypeInformation -Append
This code quickly and effortlessly parses the big csv and extracts every line that contains any of the lines in the $note file.
My next question is how do i log any lines in the $note file that were not found in the csv file.
I tried the following:
$result = $Import |Where-Object {$Note -contains $_.Name.Split('\')[4]} |Export-Csv "$Dir\Result.csv" -NoTypeInformation -Append
$Note | Where-Object {$result.Name.Split('\')[4] -notcontains $Note} | out-file $dir\not-found.log -append
This seems to return every line in $note.
#mathias-r-jessen any help you can provide would be appreciated.

Answer 1

You could use a Switch to do that.
Switch($Import){
{$Note -contains $_.Name.Split('\')[4]} {$_ | Export-Csv "$Dir\Result.csv" -NoTypeInformation -Append; continue}
default {$_ | Export-csv "$Dir\Not-Found.csv" -NoType -Append}
}
The continue in the first option makes it so that if the first case is a match it performs the relevant action, and then continues to the next record. If the first case doesn't match it moves on to the default action, which outputs it to a different file.

Answer 2

I solved it by using the following:
$result = $Import |Where-Object {$Note -contains $_.Name.Split('\')[4]}
$result | Export-Csv "$Dir\Result.csv" -NoTypeInformation -Append
$matches = $note | where-object { $result.Name -match $_}
compare-object $note $matches |where-object {$_.SideIndicator -like "<=" | select -ExpandProperty InputObject | Out-file "$Dir\Not_found.txt" -Append