What is the regex for replacing "123456-name" pattern?

Question

I am trying to rename multiple files in windows using powershell. And I want to rename replacing this pattern:

"123456-the_other_part_of_the_string". Example:

409873-doc1.txt
378234-doc2.txt
1230-doc3.txt

Basically I want to crop the numbers + '-' thing.

Answer 1

$variable -replace "^\d+-", ""

Answer 2

[0-9]*?-[^.]*

I'd recommend you take some time to learn regex, though, instead of just using answers from SO. You will run into all sorts of unusual file naming that may throw your program off in the real world and you woln't be able to fix these issues without understanding regex.

EDIT: Not sure if you also want to remove the 'name' part. If not, use this instead:

[0-9]*?-

Answer 3

Get-ChildItem . *.txt | Where {$_.Name -match '^\d+-(.*)'} | 
                        Rename-Item -NewName {$matches[1]}

or with aliases:

gci . *.txt | ?{$_.Name -match '^\d+-(.*)'} | rni -new {$matches[1]}