How to seperate CSV values within a CSV into new rows in PowerShell - powershell

Question

I'm receiving an automated report from a system that cannot be modified as a CSV. I am using PowerShell to split the CSV into multiple files and parse out the specific data needed. The CSV contains columns that may contain no data, 1 value, or multiple values that are comma separated within the CSV file itself.
Example(UPDATED FOR CLARITY):
"Group","Members"
"Event","362403"
"Risk","324542, 340668, 292196"
"Approval","AA-334454, 344366, 323570, 322827, 360225, 358850, 345935"
"ITS","345935, 358850"
"Services",""
I want the data to have one entry per line like this (UPDATED FOR CLARITY):
"Group","Members"
"Event","362403"
"Risk","324542"
"Risk","340668"
"Risk","292196"
#etc.
I've tried splitting the data and I just get an unknown number of columns at the end.
I tried a foreach loop, but can't seem to get it right (pseudocode below):
Import-CSV $Groups
ForEach ($line in $Groups){
If($_.'Members'.count -gt 1, add-content "$_.Group,$_.Members[2]",)}
I appreciate any help you can provide. I've searched all the stackexchange posts and used Google but haven't been able to find something that addresses this exact issue.

Answer 1

Import-Csv .\input.csv | ForEach-Object {
ForEach ($Member in ($_.Members -Split ',')) {
[PSCustomObject]#{Group = $_.Group; Member = $Member.Trim()}
}
} | Export-Csv .\output.csv -NoTypeInformation

Answer 2

# Get the raw text contents
$CsvContents = Get-Content "\path\to\file.csv"
# Convert it to a table object
$CsvData = ConvertFrom-CSV -InputObject $CsvContents
# Iterate through the records in the table
ForEach ($Record in $CsvData) {
# Create array from the members values at commas & trim whitespace
$Record.Members -Split "," | % {
$MemberCount = $_.Trim()
# Check if the count is greater than 1
if($MemberCount -gt 1) {
# Create our output string
$OutputString = "$($Record.Group), $MemberCount"
# Write our output string to a file
Add-Content -Path "\path\to\output.txt" -Value $OutputString
}
}
}
This should work, you had the right idea but I think you may have been encountering some syntax issues. Let me know if you have questions :)

Answer 3

Revised the code as per your updated question,
$List = Import-Csv "\path\to\input.csv"
foreach ($row in $List) {
$Group = $row.Group
$Members = $row.Members -split ","
# Process for each value in Members
foreach ($MemberValue in $Members) {
# PS v3 and above
$Group + "," + $MemberValue | Export-Csv "\path\to\output.csv" -NoTypeInformation -Append
# PS v2
# $Group + "," + $MemberValue | Out-File "\path\to\output.csv" -Append
}
}