I'm a PowerShell
newbie so please be gentle! I'm looking to bulk rename a collection of files, then pad the first digits so that they play in order on my devices.
For example, I have a folder full of mp3s ABCDEF_S3L1_010221_GHIJK.mp3
through ABCDEF_S3L49_210921_GHIJK.mp3
I'm trying to rename them as 01-lesson.mp3
through 49-lesson.mp3
where the digit after the L
is the prefix but I trip up with the padding for lessons 1-9
so they play out of order, i.e. 01
then 10
, 11
, 12
etc. I've tried using variations of .PadLeft
and {0:D2}
but keep getting errors such as:
Rename-Item: The filename, directory name, or volume label syntax is incorrect.
My code works without the initial padding:
PS G:\Temp\MP3s> Get-ChildItem -Path *.mp3 | Rename-Item
-NewName {$_.Name -replace '(^ABCDEF_S3L)(\d{1,2})_(\d{6})_(GHIJK)', '$2-lesson'}`
You can use -match
and by doing so capture the number behind the L
in $matches[1]
, which can be formatted like you want:
Get-ChildItem -Path 'D:\Test' -Filter '*.mp3' -File |
# apply better filename filter and capture the number after the 'L' in $matches[1]
Where-Object { $_.BaseName -match '^\w+_S\dL(\d+)_\d+_\w+' } |
Rename-Item -NewName { ('{0:D2}-lesson{1}' -f [int]$matches[1], $_.Extension) }