create folder name base on partial file name - powershell

Question

i have file names that have a "-" (hyphen) in the filename. I am trying to create a folder for each filename and move the file to the folder.
here is what I am trying to use:
dir | %{
$id = $_.Name.SubString(0,5);
if(-not (Test-Path $id)) {mkdir $id};
mv $_ "$id\$_";}
The issue is, some of the file names have less than 5 characters before the hyphen, so for those folders the hyphen is being added to the folder name. I've tried to use the Split verbiage, but I am stuck on syntax.
a couple of filenames examples are below:
A1909-6628.txt
A963-6634.txt
thanks in advance for your help

Answer 1

try this
#split return an array
$id = ($_.Name -split '-')[0];

Answer 2

You're pretty much on the right track, and you've mentioned the -split operator which is all you really need.
Get-ChildItem | ForEach-Object -Process {
$id = $_.BaseName.split('-')[0];
if((Test-Path $id) -eq $false){Mkdir $id}
Move-Item -Path $_.FullName -Destination $id
}
Without modifying your code too much, i added the split at the hyphen then selectin the first value after the split.

Answer 3

try this:
Get-ChildItem -file -filter "*-*" | %{
#extract first part of file
$Part1=($_.BaseName -split '-')[0].Trim()
#create directory if exist
$NewFolderName="{0}\{1}" -f $_.DirectoryName, $Part1
New-Item -ItemType Directory -Path $NewFolderName -Force -ErrorAction SilentlyContinue
#prepare new filename
$NewPathFile="{0}\{1}" -f $NewFolderName, $_.Name
#move file into new directory
Move-Item $_.FullName $NewPathFile
}