Regex 安德鲁，谢谢你的慷慨帮助。它确实找到了最高的数字，并把它放到了屏幕上。我很高兴——它做了我需要的事情——从文件中找到了最高的数字——这对我来说已经足够好了。它确实给了我一些错误，但考虑到我没有经验，我将学习更多关于这一点，并慢慢提高我的技能，再次感谢你的帮

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安德鲁，谢谢你的慷慨帮助。它确实找到了最高的数字，并把它放到了屏幕上。我很高兴——它做了我需要的事情——从文件中找到了最高的数字——这对我来说已经足够好了。它确实给了我一些错误，但考虑到我没有经验，我将学习更多关于这一点，并慢慢提高我的技能，再次感谢你的帮助。安德鲁，谢谢你的慷慨帮助。它确实找到了最高的数字，并把它放到了屏幕上。我很高兴——它做了我需要的事情——从文件中找到了最高的数字——这对我来说已经足够好了。它确实给了一些错误，但考虑到我没有经验-我将学习更多关于这一点，并慢慢建立我的技能-再次感谢你的帮助。

$list = gci "C:\Users\WP\Desktop\SearchFiles" -Include *.docx -Force -recurse
foreach ($foo in $list) {

$objWord = New-Object -ComObject word.application
$objWord.Visible = $False

$objDoc = $objWord.Documents.Open("$foo")
$objSelection = $objWord.Selection 

$Pat1 = [regex]'[A-Z]{3}-[0-9]{4}'   # Find the regex match 3 letters  followed by 4 numbers eg     HGW - 1024

$findtext= "$Pat1"

 $highestNumber = 

 # Find the highest occurrence of this pattern found in the documents searched - output to text file or on screen

Sort-Object |                   # This may also be wrong -I added it for when I find the pattern
Select-Object -Last 1 -ExpandProperty Name


<#   The below may not be needed  - ?

$ReplaceText = ""

$ReplaceAll = 2
$FindContinue = 1
$MatchFuzzy = $False
$MatchCase = $False
$MatchPhrase = $false
$MatchWholeWord = $True
$MatchWildcards = $True
$MatchSoundsLike = $False
$MatchAllWordForms = $False
$Forward = $True
$Wrap = $FindContinue
$Format = $False

$objSelection.Find.execute(
    $FindText,
    $MatchCase,
    $MatchWholeWord,
    $MatchWildcards,
    $MatchSoundsLike,
    $MatchAllWordForms,
    $Forward,
    $Wrap,
    $Format,
    $ReplaceText,
    $ReplaceAll
  }

}
#>

[regex]::matches($objSelection, '(?<=[A-Z]{3}\s*-\s*)\d{4}')  `
  | Select -ExpandProperty captures `
  | sort value -Descending `
  | Select -First 1 -ExpandProperty value `
  | Add-Content outfile.txt

# This library is needed to extact zip archives. A .docx is a zip archive
# .NET 4.5 or later is requried
Add-Type -AssemblyName System.IO.Compression.FileSystem

# This function gets plain text from a word document
# adapted from http://stackoverflow.com/a/19503654/284111
# It is not ideal, but good enough
function Extract-Text([string]$fileName) {

  #Generate random temporary file name for text extaction from .docx
  $tempFileName = [Guid]::NewGuid().Guid

  #Extract document xml into a variable ($text)
  $entry = [System.IO.Compression.ZipFile]::OpenRead($fileName).GetEntry("word/document.xml")
  [System.IO.Compression.ZipFileExtensions]::ExtractToFile($entry,$tempFileName)
  $text = [System.IO.File]::ReadAllText($tempFileName)
  Remove-Item $tempFileName

  #Remove actual xml tags and leave the text behind
  $text = $text -replace '</w:r></w:p></w:tc><w:tc>', " "
  $text = $text -replace '</w:r></w:p>', "`r`n"
  $text = $text -replace "<[^>]*>",""

  return $text
}

$fileList = Get-ChildItem "C:\Users\WP\Desktop\SearchFiles" -Include *.docx -Force -recurse
# Adapted from http://stackoverflow.com/a/36023783/284111
$fileList | 
  Foreach-Object {[regex]::matches((Extract-Text $_), '(?<=[A-Za-z]{3}\s*(?:-|–)\s*)\d{4}')} | 
  Select-Object -ExpandProperty captures | 
  Sort-Object value -Descending | 
  Select-Object -First 1 -ExpandProperty value