Split CSV files using a specific line - powershell

Question

I would like to split the following csv into two csvs
StartOrder,1,SupplierName,
Line,2,12345,2,5,5.50,
Line,3,12345,3,6,5.20,
Line,4,12345,3,7,1.99,
EndOrder,5,booked as soon as possible to deliver.
StartOrder,6,SupplierName
Line,7,100015,2,5,5.50,
Line,8,100015,3,6,5.20,
Line,9,100015,3,7,1.99,
EndOrder,10,booked as soon as possible to deliver.
in order to be:
1st file
StartOrder,1,SupplierName,
Line,2,12345,2,5,5.50,
Line,3,12345,3,6,5.20,
Line,4,12345,3,7,1.99,
EndOrder,5,booked as soon as possible to deliver.
2nd file
StartOrder,6,SupplierName
Line,7,100015,2,5,5.50,
Line,8,100015,3,6,5.20,
Line,9,100015,3,7,1.99,
EndOrder,10,booked as soon as possible to deliver.
I have tried using GroupBy but is not working as I am expecting.
Any help?

Answer 1

This is something i would do with Regular Expressions.
$orders = (get-content -path C:\temp\orders.txt)
$orders = [string]::Join("`n",$orders) # this is to make sure you keep your lines
$output = [regex]::Matches($orders,'(?s)(StartOrder,(\d{0,}).*?deliver.)') # added regex option S
foreach($c in $output){
$order = $c.groups[2].value #order name that will serve as filename
""
$c.groups[0].value # content of order
$c.groups[0].value | out-file C:\temp\$order.txt -Force
}
This wil create a 1.txt and a 6.txt with its needed content.
EDIT : The only issue is that it doesn't keep the enters. -> FIXED THAT
The Regex is fairly simple, more detail on the regex : https://regex101.com/r/J0Xsu7/1
This will give you file 1.txt with
StartOrder,1,SupplierName,
Line,2,12345,2,5,5.50,
Line,3,12345,3,6,5.20,
Line,4,12345,3,7,1.99,
EndOrder,5,booked as soon as possible to deliver.
This will give you file 6.txt with
StartOrder,6,SupplierName
Line,7,100015,2,5,5.50,
Line,8,100015,3,6,5.20,
Line,9,100015,3,7,1.99,
EndOrder,10,booked as soon as possible to deliver.