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PowerShell with regex to rename files

Renaming files is quite an easy task but if the files to be renamed are about 100 files or more then you have to think twice and is not fun doing repetitive simple task.

Anyway, PowerShell is handy for this kind of task.

Regex in PowerShell is helpful in order to filter only matching files that needs to be renamed and leave any other files that doesn’t need  to be changed.

Example filename is like this: SampleTestData1_2019Result.csv

New desired filename would be:  SampleTestData1_2020.csv

PowerShell code with regex to rename matching files.

How to use basic regex in PowerShell? The code below is a simple one.

Get-ChildItem  -Path "c:\dev"| Where-Object {$_.BaseName -Match '2019.*'} |
  Rename-Item -NewName {($_.BaseName -Replace '2019.*', '2020')+$_.Extension} 

#'2019.*' – is the regex that matches 2019 until the end of the string
#'2019.*', '2020' – replace the match string with 2020

* = in regex match any character or basically don't care what character

Rather than specifying one by one files with "2019" regex will automatically do the job. Saves a lot of time.


Search the web for "regex operator" to know more.


That’s it a one liner PowerShell code can save the day.


Cheers. Till next time.


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