PowerShell Array Filter - arrays

Question

I have an array piped into PowerShell. Trying to select what matches today through the next 3 weeks.
1/4/2023 First Last
1/11/2023 First Last
1/19/2023 First Last
1/25/2023 First Last
2/1/2023 First Last
2/8/2023 First Last
2/15/2023 First Last
2/22/2023 First Last
3/1/2023 First Last
3/8/2023 First Last
Expected results would be:
1/19/2023 First Last
1/25/2023 First Last
2/1/2023 First Last
2/8/2023 First Last
Was trying to modify this to get results, but not getting what I need.
$referenceDate = (Get-Date).AddDays(21)
Get-Content -Path 'Dates.ini' |
Where-Object { $_ -match '^(\d{2}/\d{2}/\d{4})' } |
Where-Object { [datetime]::ParseExact($matches[1], 'MM/dd/yyyy', $null) -gt $referenceTime } |
ForEach-Object {
$_
#DO SOMETHING.. For demo just output the line(s) that matched
}
My PowerShell kung foo is not strong, and would be very grateful for the answer...
Listed in details. PowerShell version is default for Server 2019.

Answer 1

I would definitely consider using a switch here with the -Regex flag:
$referenceDate = (Get-Date).AddDays(21)
switch -Regex -File Dates.ini {
'^(?:\d{1,2}/){2}\d{4}' {
$date = Get-Date $Matches[0]
if($date -ge [datetime]::Today -and $date -le $referenceDate) {
$_
}
}
}
Regarding your code, it's almost correct, there are 3 problems:
The regex needs a bit tweaking.
The call to ParseExact is not using the correct Date Format.
You're currently filtering for dates greater than 3 weeks, instead what you want is lower than or equal to 3 weeks and greater than or equal to Today.
$referenceDate = (Get-Date).AddDays(21)
Get-Content -Path 'Dates.ini' |
Where-Object { $_ -match '^(\d{1,2}/\d{1,2}/\d{4})' } |
Where-Object {
$date = [datetime]::ParseExact($Matches[1], 'M/d/yyyy', $null)
$date -ge [datetime]::Today -and $date -le $referenceDate
} | ForEach-Object { $_ }