So I helped someone do this earlier but I was curious as to why it messed up when I made it into a one liner.

It’s probably something dumb I’m doing so I figured I’d ask.

Can someone explain to me why this messes up the first entry?

Get-ChildItem C:/temp/test -Filter *0* | ?{$_.attributes -eq "Directory"} | Rename-Item -NewName { [regex]$pattern = "0"; $pattern.replace($_.name, "2", 1)} -Verbose

It makes my structure like this:

C:\temp\221
C:\temp\202
C:\temp\203
C:\temp\204

If I run

Get-ChildItem C:/temp/test -Filter *0* | ?{$_.attributes -eq "Directory"} | Rename-Item -NewName { [regex]$pattern = "0"; $pattern.replace($_.name, "2", 1)} -WhatIf

It shows properly but when I run the command the first folder always has two 2s'(becomes 221). I feel dumb but maybe it is because I am tired.

my structure is:

C:/temp/test/001
C:/temp/test/002
C:/temp/test/003
C:/temp/test/004

Solution:

It needs to have the first portion in braces to prevent it from re-reading. Thanks u/Lee_Dailey and to u/l0wet for showing me the “-Directory” feature of GCI (I’m still a scrub it appears!)

(Get-ChildItem C:/temp/test -Filter *0* -Directory) | Rename-Item -NewName { [regex]$pattern = "0"; $pattern.replace($_.name, "2", 1)}