Replace all Guids in a File

guidswap.ps1

## GuidSwap.ps1
##
## Reads a file, finds any GUIDs in the file, and swaps them for a NewGUID
##

# Paste whichever file you'd like to execute this script for
# IMPORTANT.
$filename = "{FILEPATH HERE}"
$text = [string]::join([environment]::newline, (get-content -path $filename))

$sbNew = new-object system.text.stringBuilder

$pattern = "[a-fA-F0-9]{8}-([a-fA-F0-9]{4}-){3}[a-fA-F0-9]{12}"

$lastStart = 0
$null = ([regex]::matches($text, $pattern) | % {
        $sbNew.Append($text.Substring($lastStart, $_.Index - $lastStart))
        $guid = [system.guid]::newguid()
        $sbNew.Append($guid)
        $lastStart = $_.Index + $_.Length
    })
$null = $sbNew.Append($text.Substring($lastStart))

$sbNew.ToString() | out-file -encoding ASCII $filename

Write-Output "Done"

Inspiration: https://stackoverflow.com/questions/2201740/replacing-all-guids-in-a-file-with-new-guids-from-the-command-line/2283754#2283754

Powershell command on Windows to run: powershell -noexit C:\Users\{filepath of the above script}.ps1