PowerShell add string before pattern in a file - powershell

Question

I'm trying to add a line in a .sln file before the $pattern. The only problem is that when I try to add the $firstOccurrence condition in the if statement it doesn't add anything at all. It still triggers the Write-Debug.
The first occurrence part is now commented out but I can't seem to find out why it doesn't write anything when I set the first occurrence.
Original source to my solution can be found here:
How to declare a variable and its type is Boolean in PowerShell?
$firstOccurrence = $true;
$pattern = "Global"
(Get-Content $fileName) | Foreach-Object {
#if ($firstOccurrence) {
if ($_ -match $pattern) {
Write-Debug "test"
$firstOccurrence = $false
#Add Lines after the selected pattern
"aaaaaaaaaaaaaaaaaaaaaaa"
}
#}
# send the current line to output
$_
} | Set-Content $fileName

Answer 1

You could also do this using (very fast) switch -Regex like:
$fileName = 'D:\Test\blah.txt'
$firstOccurrence = $true
$pattern = "Global"
$insert = "aaaaaaaaaaaaaaaaaaaaaaa"
$newContent = switch -Regex -File $fileName {
$pattern {
if ($firstOccurrence) {
$insert
$firstOccurrence = $false
}
$_
}
default { $_ }
}
$newContent | Set-Content $fileName -Force
Or did you perhaps mean this:
$fileName = 'D:\Test\blah.txt'
$pattern = "Global"
$insert = "aaaaaaaaaaaaaaaaaaaaaaa"
((Get-Content -Path $fileName -Raw) -split $pattern, 2) -join "$insert $pattern" | Set-Content $fileName -Force
?