Powershell 重命名包含方括号的动态文件名，来自目录中的文件类型扫描

Question

I don't much know(in details and specifics) about Powershell's silly and ridiculous issues/bugs in handling square brackets(just because it escapes strings multiple times internally) in the path strings, where I have to use Regex with asterisk(*) to match/catch the patterns.

I did heavy Googling and found that there's method [WildcardPattern]::Escape($Filename) that could help me Rename-Item such dynamic file paths, I thought the below code would work with such dynamic paths which are result of file-type scans in the current folder, but disappointingly, it doesn't:

Set-Location "$PSScriptRoot"
$MkvFiles = Get-ChildItem -Filter *.mkv -Path $Path
Foreach ($MkvFile in $MkvFiles) {
    $MkvOrigName = [WildcardPattern]::Escape($MkvFile.Name)
    $MkvOrigFullname = [WildcardPattern]::Escape($MkvFile.FullName)
    If ($MkvOrigName -Match '.*(S[0-9]{2}E[0-9]{2}).*') {
        $NewNameNoExt = $MkvOrigFullname -Replace '.*(S[0-9]{2}E[0-9]{2}).*', '$1'
        $NewName = "$NewNameNoExt.mkv"
        Rename-Item $MkvOrigFullname -NewName $NewName
    }
}

I am getting the following error with Rename-Item command when I run the above script on the folder that contains the files such as given at the end of question:

Rename-Item : An object at the specified path C:\Users\Username\Downloads\WebseriesName Season 
4\WebSeriesName.2016.S04E13.iNTERNAL.480p.x264-mSD`[eztv`].mkv does not exist.
At C:\Users\Username\Downloads\WebseriesName Season 4\BulkFileRenamerFinalv1.ps1:12 char:9
+         Rename-Item $MkvOrigFullname -NewName $NewName
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The Webseries file paths in the current folder, that I am dealing with are like these:

WebSeriesName.2016.S04E01.HDTV.x264-SVA[eztv].mkv
WebSeriesName.2016.S04E02.HDTV.x264-SVA[eztv].mkv
....
....
WebSeriesName.2016.S04E12.iNTERNAL.480p.x264-mSD[eztv].mkv
WebSeriesName.2016.S04E13.iNTERNAL.480p.x264-mSD[eztv].mkv

Someone could help me figuring out this problem generically without need to headbang with what the filenames strings contain, as long as they contain the string like S04E01 , S04E02 etc. and surely contain square brackets? That is, how can I escape the square brackets and rename them, as apparent in the code afore-mentioned, to the names given below?

S04E01.mkv
S04E02.mkv
....
....
S04E12.mkv
S04E13.mkv

Answer 1

If you use the pipeline, you don't need to worry about escaping paths. This is because PSPath property will automatically bind to the -LiteralPath parameter on Rename-Item .

Set-Location "$PSScriptRoot"
$MkvFiles = Get-ChildItem -Filter *.mkv -Path $Path
Foreach ($MkvFile in $MkvFiles) {
    If ($MkvFile.Name -Match '.*(S[0-9]{2}E[0-9]{2}).*') {
        $MkvFile | Rename-Item -NewName {"{0}{1}" -f $matches.1,$_.Extension}
    }
}

Explanation:

The -NewName parameter supports delay-bind scripting . So we can use a script block to do the property/string manipulation.

If wildcards are not needed for the path query, then using -LiteralPath is the best approach. The -LiteralPath value is bound exactly as typed (literal/verbatim string). -Path for Get-ChildItem accepts wildcards, but -Path for Rename-Item does not support wildcards. Yet it seems like PowerShell still cares when parsing the command. If you must escape some wildcard characters in a -Path parameter that accepts wildcards, then double quoted paths require 4 backticks and single quoted paths require 2 backticks. This is because two levels of escape are required.

When using -match against a single string even if in a conditional statement, the $matches automatic variable is updated when a match is successful. Capture group matches are accessed using syntax $matches.capturegroupname or $matches[capturegroupname] . Since you did not name the capture group, it was automatically named 1 by the system. A second set of () around a capturing group, would have been 2 . It is important to remember that when -match is False , $matches is not updated from its previous value.

---

Examples of handling wildcard characters in -Path parameters that support wildcards:

# Using double quotes in the path
$Path = "WebSeriesName.2016.S04E01.HDTV.x264-SVA````[eztv].mkv"
Get-ChildItem -Path $Path

# Using single quotes in the path
$Path = "WebSeriesName.2016.S04E01.HDTV.x264-SVA``[eztv].mkv"
Get-ChildItem -Path $Path

# Using LiteralPath
$Path = "WebSeriesName.2016.S04E01.HDTV.x264-SVA[eztv].mkv"
Get-ChildItem -LiteralPath $Path
Rename-Item -LiteralPath $Path -NewName 'MyNewName.mkv'

# Using WildcardPattern Escape method
$Path = 'WebSeriesName.2016.S04E01.HDTV.x264-SVA[eztv].mkv'
$EscapedPath = ([WildcardPattern]::Escape([WildcardPattern]::escape($path)))
Get-ChildItem -Path $EscapedPath