如何在尝试保存文件名之前去除非法字符? [英] How to strip illegal characters before trying to save filenames?

问题描述

我找到了如何在 PowerShell 脚本中使用 GetInvalidFileNameChars() 方法.但是，它似乎也过滤掉了空格(这是我不想要的).

I was able to find how to use the GetInvalidFileNameChars() method in a PowerShell script. However, it seems to also filter out whitespace (which is what I DON'T want).

也许我问得不够清楚.我希望下面的函数包含文件名中已经存在的空格.目前，脚本会过滤掉空格.

Maybe I'm not asking this clearly enough. I want the below function to INCLUDE the spaces that already existing in filenames. Currently, the script filters out spaces.

Function Remove-InvalidFileNameChars {

param([Parameter(Mandatory=$true,
    Position=0,
    ValueFromPipeline=$true,
    ValueFromPipelineByPropertyName=$true)]
    [String]$Name
)

return [RegEx]::Replace($Name, "[{0}]" -f ([RegEx]::Escape([String][System.IO.Path]::GetInvalidFileNameChars())), '')}

推荐答案

casting the character array to System.String 实际上好像用空格连接了数组元素，意思是

Casting the character array to System.String actually seems to join the array elements with spaces, meaning that

[string][System.IO.Path]::GetInvalidFileNameChars()

与

[System.IO.Path]::GetInvalidFileNameChars() -join ' '

当你真正想要时

[System.IO.Path]::GetInvalidFileNameChars() -join ''

正如 @mjolinor 提到的 (+1)，这是由 输出字段分隔符($OFS).

As @mjolinor mentioned (+1), this is caused by the output field separator ($OFS).

证据:

PS C:\> [RegEx]::Escape([string][IO.Path]::GetInvalidFileNameChars())
"\ \ \|\  \ ☺\ ☻\ ♥\ ♦\ ♣\ ♠\ \\ \t\ \n\ ♂\ \f\ \r\ ♫\ ☼\ ►\ ◄\ ↕\ ‼\ ¶\ §\ ▬\ ↨\ ↑\ ↓\ →\ ←\ ∟\ ↔\ ▲\ ▼\ :\ \*\ \?\ \\\ /
PS C:\> [RegEx]::Escape(([IO.Path]::GetInvalidFileNameChars() -join ' '))
"\ \ \|\  \ ☺\ ☻\ ♥\ ♦\ ♣\ ♠\ \\ \t\ \n\ ♂\ \f\ \r\ ♫\ ☼\ ►\ ◄\ ↕\ ‼\ ¶\ §\ ▬\ ↨\ ↑\ ↓\ →\ ←\ ∟\ ↔\ ▲\ ▼\ :\ \*\ \?\ \\\ /
PS C:\> [RegEx]::Escape(([IO.Path]::GetInvalidFileNameChars() -join ''))
"\| ☺☻♥♦\t\n♂\f\r♫☼►◄↕‼¶§▬↨↑↓→←∟↔▲▼:\*\?\\/
PS C:\> $OFS=''
PS C:\> [RegEx]::Escape([string][IO.Path]::GetInvalidFileNameChars())
"\| ☺☻♥♦\t\n♂\f\r♫☼►◄↕‼¶§▬↨↑↓→←∟↔▲▼:\*\?\\/

把你的函数改成这样:

Function Remove-InvalidFileNameChars {
  param(
    [Parameter(Mandatory=$true,
      Position=0,
      ValueFromPipeline=$true,
      ValueFromPipelineByPropertyName=$true)]
    [String]$Name
  )

  $invalidChars = [IO.Path]::GetInvalidFileNameChars() -join ''
  $re = "[{0}]" -f [RegEx]::Escape($invalidChars)
  return ($Name -replace $re)
}

它应该做你想做的.

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