Looking for a way to delete files in a directory depending on their extension's case [closed] - powershell

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I would love your help with a tool that would greatly simplify my life. As of now I have no scripting knowledge. I am not sure which of powershell or a .bat is the best suited to my need :
I have a folder with thousands of little files with various extension names. Sometimes I need to delete all the files that have their extension written in uppercase, sometimes the ones in lowercase.
I need a script that would ask me in input if I want to delete Upper or Lowercase files and then would go deleting all the files in the folder with an extension in Upper or Lowercase (based on the input).
I have no idea where to begin. Could you please share some ideas ?
Thanks for your time

Answer 1

One way would be to use the -match regular expression operator. Since PowerShell operators always defaults to case-insensitive string comparison, we'll need to qualify it with a c, so -cmatch. To match only upper-case letters, I usually use the regex class \p{Lu} (Lu stands for "Letters, upper"):
$allUppercase = Get-ChildItem -Path C:\path\to\folder\ |Where-Object {$_.Extension -cmatch '^.\p{Lu}+$'}
and now you can delete them with Remove-Item:
$allUppercase |Remove-Item -Force
if you want extensions with lowercase only, test for \p{Ll}:
$allLowercase = Get-ChildItem -Path C:\path\to\folder\ |Where-Object {$_.Extension -cmatch '^.\p{Ll}+$'}