Using Array and get-childitem to find filenames with specific ids - powershell

Question

In the most basic sense, I have a SQL query which returns an array of IDs, which I've stored into a variable $ID. I then want to perform a Get-childitem on a specific folder for any filenames that contain any of the IDs in said variable ($ID) There are three possible filenames that could exist:
$ID.xml
$ID_input.xml
$ID_output.xml
Once I have the results of get-childitem, I want to output this as a text file and delete the files from the folder. The part I'm having trouble with is filtering the results of get-childitem to define the filenames I'm looking for, so that only files that contain the IDs from the SQL output are displayed in my get-childitem results.
I found another way of doing this, which works fine, by using for-each ($i in $id), then building the desired filenames from that and performing a remove item on them:
# Build list of XML files
$XMLFile = foreach ($I in $ID)
{
"$XMLPath\$I.xml","$XMLPath\$I`_output.xml","$XMLPath\$I`_input.xml"
}
# Delete XML files
$XMLFile | Remove-Item -Force
However, this produces a lot of errors in the shell, as it tries to delete files that don't exist, but whose IDs do exist in the database. I also can't figure out how to produce a text output of the files that were actually deleted, doing it this way, so I'd like to get back to the get-childitem approach, if possible.
Any ideas would be greatly appreciated. If you require more info, just ask.

Answer 1

You can find all *.xml files with Get-ChildItem to minimize the number of files to test and then use regex to match the filenames. It's faster than a loop/multiple test, but harder to read if you're not familiar with regex.
$id = 123,111
#Create regex-pattern (search-pattern)
$regex = "^($(($id | ForEach-Object { [regex]::Escape($_) }) -join '|'))(?:_input|_output)?$"
$filesToDelete = Get-ChildItem -Path "c:\users\frode\Desktop\test" -Filter "*.xml" | Where-Object { $_.BaseName -match $regex }
#Save list of files
$filesToDelete | Select-Object -ExpandProperty FullName | Out-File "deletedfiles.txt" -Append
#Remove files (remove -WhatIf when ready)
$filesToDelete | Remove-Item -Force -WhatIf
Regex demo: https://regex101.com/r/dS2dJ5/2

Answer 2

Try this:
clear
$ID = "a", "b", "c"
$filesToDelete = New-Object System.Collections.ArrayList
$files = Get-ChildItem e:\
foreach ($I in $ID)
{
($files | Where-object { $_.Name -eq "$ID.xml" }).FullName | ForEach-Object { $filesToDelete.Add($_) }
($files | Where-object { $_.Name -eq "$ID_input.xml" }).FullName | ForEach-Object { $filesToDelete.Add($_) }
($files | Where-object { $_.Name -eq "$ID_output.xml" }).FullName | ForEach-Object { $filesToDelete.Add($_) }
}
$filesToDelete | select-object -Unique | ForEach-Object { Remove-Item $_ -Force }