Get-ChildItem加正则不递归及删除._FILENAME脚本递归失效问题咨询

Hey there! Let's work through these two PowerShell headaches together—they're both super common, so I’ve got straightforward fixes for you.

The most likely issue here is mixing up PowerShell's wildcard filters with true regex, or using the wrong parameters alongside -Recurse. Here's the breakdown:

• Get-ChildItem's -Filter and -Include parameters use PowerShell wildcards (like *, ?, []), not full regular expressions. If you tried passing a regex directly to these parameters, it won't behave as expected.
• To use regex for matching, you need to pipe the recursive results to Where-Object and use the -match operator, which supports proper regex syntax.

Here's a working example to recursively find files matching your regex pattern:

# Replace "C:\Your\Root\Path" with your target directory
# Replace "^YourRegexPattern$" with your actual regex (e.g., "^report_\d{4}\.txt$" for files like report_2024.txt)
Get-ChildItem -Path "C:\Your\Root\Path" -Recurse -File | Where-Object { $_.Name -match "^YourRegexPattern$" }

If you only need wildcards (not full regex), you can simplify with -Include—just make sure your path ends with * to ensure recursion works correctly:

Get-ChildItem -Path "C:\Your\Root\Path\*" -Recurse -Include "*.log"

Your script is only scanning the current directory because it's missing the -Recurse parameter. Let's fix that with a safe, tested approach:

First, always preview the files you're about to delete to avoid accidental data loss. Run this command to list all ._-prefixed files recursively:

# Replace "C:\Your\Target\Directory" with your root folder
Get-ChildItem -Path "C:\Your\Target\Directory" -Recurse -Filter "._*" -File

Once you confirm the list is correct, you can delete them. Add -WhatIf first to simulate the deletion (no files will actually be removed):

Get-ChildItem -Path "C:\Your\Target\Directory" -Recurse -Filter "._*" -File | Remove-Item -WhatIf

If the simulation looks good, remove -WhatIf to perform the actual deletion:

Get-ChildItem -Path "C:\Your\Target\Directory" -Recurse -Filter "._*" -File | Remove-Item

Extra Tips: #

• Add -Force to delete read-only ._ files, if needed: Remove-Item -Force
• If you need to target only specific ._FILENAME matches (not all ._ files), swap -Filter for a regex check with Where-Object, like:

  Get-ChildItem -Path "C:\Your\Target\Directory" -Recurse -File | Where-Object { $_.Name -match "^._SpecificFileName$" } | Remove-Item
  

内容的提问来源于stack exchange，提问作者Jonathan Lafleur