Moving every n files into a separate folder - powershell

Question

I have several files with a repetitive naming convention, e.g.
1*Intro*
2*
3*
…
10*intro*
….
I want to move each module into a separate folder. So, I should separate from every *intro* till the next one.
Also, I should note that files are numbered and sorted.
I guess, the easiest way to do this is to:
1. Get a list of intros.
2. Separate their numbers.
3. Start moving files starting from one number till their smaller than the next one.
$i = 1
Ls *intro* | ft {$_.name -replace '\D.*', ''}
// The reason for .* is that the files are `mp4`.
Ls * | ? {$_.name -match '[^firstNumber-SecondNumber-1]'} | move-item -literalpath {$_.fullname} -destination $path + $i++ + '/' +{$_.name}
So the last command should be something like:
Ls *intro* | % { ls * | ? {…} | move-item … }
Or maybe the move-item itself can do the filtering job.
The regular expression doesn't work and I don't have enough Powershell knowledge to write anything better. Can you think of any script to do that? Also how should I permit move-item to create the folder?
I'll be thankful if someone could edit this post with a better title.

Answer 1

This could be done with a simple Switch. The switch will be run against all items in the current folder (items gotten with the Get-ChildItem cmdlet which you use by it's alias 'LS'). It looks to see if the file has the string "Intro" in the file name. If it does, it creates a new folder with that file's name, and stores that folder's info in the $TargetFolder variable (variable created previously to avoid scoping issues). It then moves the file to that folder, and continues to the next file. If the file does not have "Intro" in its file name it simply moves the file to whatever the last assigned $TargetFolder is that was created.
$TargetFolder = ""
Switch(Get-ChildItem .\*){
{$_.BaseName -match "intro"} {$TargetFolder = New-Item ".\$($_.BaseName)" -ItemType Directory; Move-Item $_ -Destination $TargetFolder; Continue}
default {Move-Item $TargetFolder}
}