如何忽略存储在PowerShell字符串变量中的转义序列？ [英] How to ignore escape sequences stored in PowerShell string variable?

问题描述

在我的PowerShell脚本中，我在多个文件中运行Select-String，通过一个变量（$ id）查找一个传递给它的字符串：

  foreach（$ file in（lspath\to\files））{
 $ found = $ false 
 $ found = Select-String -Path $ file $ id -Quiet 
 if（$ found）{
 break 
} 
} 
  

不幸的是，$ id变量有时像\C或\T这样，而Select-String尝试将其解释为转义序列。这些不是有效的转义序列，所以Select-String会引发错误。它们不是作为转义序列（例如，它可以是文件路径的一部分，例如C：\Test），那么如何防止PowerShell / Select-String解释它们呢？我试过在$ id附近使用括号，没有运气。

解决方案

使用静态 escape（）方法，表达式引擎来解释这些字符而不是元字符：

  $ id = [regex] :: escape（$ id）
  

您也可以将命令转到一个班轮（ -path 可以收集文件）：

 选择字符串-Path path\toto\files\ \ * -Pattern（[regex] :: escape（$ id））-Quiet 
  

In my PowerShell script, I'm running Select-String over a number of files, looking for a string passed into it via a variable ($id):

foreach ($file in (ls "path\to\files")) {
    $found = $false
    $found = Select-String -Path $file $id -Quiet
    if ($found) {
        break
    }
}

Unfortunately, the $id variable sometimes things like "\C" or "\T", which Select-String tries to interpret as escape sequences. These are not valid escape sequences, so Select-String throws an error. They are not intended to be escape sequences (e.g., it could be part of a file path such as "C:\Test"), so how can I prevent PowerShell/Select-String from interpreting them as such? I've tried using parentheses around $id with no luck.

解决方案

Use the static escape() method, it instructs the regular expression engine to interpret these characters literally rather than as metacharacters:

$id = [regex]::escape($id)

You can also turn the command to a one liner (-path can take a collection of files):

Select-String -Path path\to\files\\* -Pattern ([regex]::escape($id)) -Quiet

这篇关于如何忽略存储在PowerShell字符串变量中的转义序列？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！