Regex 看起来很有希望。我故意排除了它们，但我更改了代码以包含它们。此外，我每次都更改为检查现有文件名。这在使用更大的测试集时不会出现错误。只有以下结构为“-664569”作为BaseName的文件不会被拾取。对于其余部分，这看起来很有希望。我故意排除了它们，但我

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看起来很有希望。我故意排除了它们，但我更改了代码以包含它们。此外，我每次都更改为检查现有文件名。这在使用更大的测试集时不会出现错误。只有以下结构为“-664569”作为BaseName的文件不会被拾取。对于其余部分，这看起来很有希望。我故意排除了它们，但我更改了代码以包含它们。另外，我每次都会检查现有的文件名。

$files = Get-ChildItem <location> -recurse -file | sort name | group-object -property {$_.fullname -replace "(.*)-.*?(\..*?)$",'$1$2'}
$files | foreach {
    $inc = 0

    if ($_.count -gt 1) {
        rename-item -literalpath $_.group[0].fullname -NewName (($_.group[0].basename -replace "(.*)-.*?$",'$1') + $_.group[0].extension)
        $inc++

    for ($i = $inc; $i -lt $_.count; $i++) {

        rename-item -literalpath $_.group[$i].fullname -NewName (($_.group[$i].basename -replace "(.*)-.*?$",'$1') + "($i)" + $_.group[$i].extension)
    }
    }
    else {
        rename-item -literalpath $_.group.fullname -NewName (($_.group.basename -replace "(.*)-.*?$",'$1') + $_.group.extension)   
}
}

1 - 13234.txt
1.txt

$Path = '<PATH TO THE ROOTFOLDER WHERE THE FILES TO RENAME ARE FOUND>'

Get-ChildItem -Path $Path -Filter '*-*' -File -Recurse | ForEach-Object {
    # obtain the new file basename
    $newBaseName = ($_.BaseName -split '-')[0].Trim()
    $extension   = $_.Extension    # this includes the dot
    $folder      = $_.DirectoryName

    # get an array of all filenames (name only) of the files with a similar name already present in the folder
    $allFiles = @(Get-ChildItem $folder -Filter "$newBaseName*$extension" -File | Select-Object -ExpandProperty Name)
    # for PowerShell version < 3.0 use this
    # $allFiles = @(Get-ChildItem $folder-Filter "$newBaseName*$extension" | Where-Object { !($_.PSIsContainer) } | Select-Object -ExpandProperty Name)

    # construct the new filename
    $newFileName = $newBaseName + $extension

    if ($allFiles.Count) {
        $count = 1
        while ($allFiles -contains $newFileName) {
            $newFileName = "{0}({1}){2}" -f $newBaseName, $count++, $extension
        }
    }

    Write-Host "Renaming '$($_.FullName)' to '$newFileName'"
    $_ | Rename-Item -NewName $newFileName -Force
}