如何使用 Powershell 从 XML 中删除特殊/坏字符

Question

我有一个 XML 文件，我想从以下文件中删除那些十六进制字符错误是无效字符：

我不知道 STX 是什么意思，当我尝试将其复制到剪贴板并将其粘贴到 MS Work 中时，它显示了一些其他值。

如何在 powershell 中编写脚本以从我的 XML 文件中删除上述内容。

Answer 1

以下正则表达式将通过指定一个否定XML文档中整个有效unicode条目集的字符类来从XML中删除所有无效字符：

$rPattern = "[^\x09\x0A\x0D\x20-\xD7FF\xE000-\xFFFD\x10000\x10FFFF]"
$xmlText -replace $rPattern,''

这可以很容易地变成一个简单的函数 ：

function Repair-XmlString
{
  [CmdletBinding()]
  param(
    [Parameter(Mandatory=$true,Position=0)]
    [string]$inXML
  )

  # Match all characters that does NOT belong in an XML document
  $rPattern = "[^\x09\x0A\x0D\x20-\xD7FF\xE000-\xFFFD\x10000\x10FFFF]"

  # Replace said characters with [String]::Empty and return
  return [System.Text.RegularExpressions.Regex]::Replace($inXML,$rPattern,"")
}

然后做：

Repair-XmlString (Get-Content path\to\file.xml -Raw) |Set-Content path\to\file.xml 

Answer 2

功能更新:)

function Repair-XmlString {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true, Position = 0,ValueFromPipeline)]
        [ValidateNotNullOrEmpty()]
        [string]$String
    )
    Write-Host "Cleaning string for XML parsing [String: $($String)]"
    $rPattern = "[^\x09\x0A\x0D\x20-\xD7FF\xE000-\xFFFD\x10000\x10FFFF]"
    $cleaned = $String -replace $rPattern, ''
    Write-Host "Returning parsed string [String cleaned: $($cleaned)]"
    return $cleaned
}

Answer 3

# Another way, No 'Repair-XmlString' function needed, just wrap the string in single quotes
# This is an example of exporting install software names that have foreign characters. 

# Wrap output string with foreign characters in single quotes
$InstalledSoftware = Get-ChildItem HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\, HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\ |  Get-ItemProperty | select @{n="DisplayName";e={"\`'$($_.DisplayName)\`'"}}, DisplayVersion  

# Create Hastable
$SoftwareHashTable = @{SoftwareName = $InstalledSoftware }
# Output file path
$outFile = "$env:USERPROFILE\Desktop\HashFile.xml"   
# Export to hashtable xml                                                             
Export-Clixml -InputObject $SoftwareHashTable -Depth 4 -Path $outFile -Encoding UTF8 
# Import xml Hashtable
$ImportedXml = Import-Clixml $outFile    
# View values                                                                         
$ImportedXml.Values