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如何使用 Powershell 转义 Write-Output 中的字符？

tag-icon • tag-icon windows-10 powershell escape-characters
如何使用 Powershell 转义 Write-Output 中的字符？

我正在使用 -Match "$software" 在列表中搜索 $software。我还想将 $software 写入输出到屏幕上。

对于 Notepad++，我必须转义第二个 +。我尝试过
$software=Notepad+{backtick}+以下错误：parsing "Notepad++" - Nested quantifier +.

Notepad+\\+这不会出错，但会使用 Write-Output 写入 Notepad+\\+

完整代码

$software="Notepad++"
Check-if-Installed $software    
    
Function Check-if-Installed{
    param (
        [parameter(Mandatory=$true)]$software_to_check
        )
    Write-Output "Checking if $software_to_check is installed"
    if ((gp HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*).DisplayName -Match "$software_to_check" -or 
    (gp HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*).DisplayName -Match "$software_to_check")
    {Write-Output "$software_to_check Installed"
    
   
} else {Write-Output "$software_to_check Not Installed"}
}

答案1

你可以写类似的东西：

Function Replace-SpecialChars {
    param($InputString)
    $SpecialChars = '[+]'
    $Replacement  = '\+'
    $InputString -replace $SpecialChars,$Replacement
}

Function Check-if-Installed {
param ([parameter(Mandatory=$true)]$software_to_check)
Write-Host "Checking if $software_to_check is installed"
$OS_Architecture = $env:PROCESSOR_ARCHITECTURE
if($OS_Architecture -eq 'x86') 
{
    #32-bit
    $key = "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*"
}
else
{
    #64-bit
    $key = "HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*"
}
$software = Replace-SpecialChars -InputString "$software_to_check"
    If((Get-ItemProperty $Key).DisplayName -Match "$software") { 
      Write-Host "$software_to_check is Installed" -Fore Green 
    } 
    else 
    { Write-Host "$software_to_check is not Installed" -Fore Red}
}

$software="Notepad++"
Check-if-Installed $software
# If you want to check within array :
$Software_Array = @("Notepad++","firefox","chrome","Bitdefender","Powershell","7-zip","winrar","winzip","Hackoo")
ForEach ($Soft in $Software_Array) {
    Check-if-Installed $soft
}

答案2

该-Match运算符使用正则表达式。Write-Output采用文字或扩展字符串。

Escape类的方法将Regex返回一个所有特殊字符都已转义的字符串。使用此字符串进行匹配操作。

$software = 'Notepad++'
    
Function Check-if-Installed{
    param (
        [parameter(Mandatory=$true)]$software_to_check
        )
    $UnInstall64 = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*'
    $UnInstall32 = 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*'

    Write-Output "Checking if $software_to_check is installed"

    $MatchString = [Regex]::Escape($software_to_check)

    If (( gp $UnInstall64 ).DisplayName -Match $MatchString -or 
        ( gp $UnInstall32 ).DisplayName -Match $MatchString )
    {
        Write-Output "$software_to_check Installed"
    }
    else
    {
        Write-Output "$software_to_check Not Installed"
    }
}

# In PowerShell, you have to define a fucdtion before you refence it.

Check-if-Installed $software

附言

虽然通配符在路径中很容易使用，但它们似乎不是处理注册表路径的最有效方法。尝试以下代码来测试获取相同数据的三种不同方法：

$UnInstall64  = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*'
$UnInstall64B = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall'

Measure-Command  { (gp $Uninstall64).DisplayName }

Measure-Command  { (gci $Uninstall64B | gp).DisplayName }

Measure-Command  { (gci $Uninstall64B).ForEach({ $_.GetValue('DisplayName') }) }

在这种情况下可能微不足道，但在挖掘类似的东西时可能会产生很大的不同HKCR\CLSID\...。

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