Replace string of text in powershell

Question

I'm trying to replace string of text and I get The regular expression pattern is not valid.

This is to be able to change a policy using LGPO

$TextToBeReplaced="Computer`r`nSOFTWARE\Policies\Microsoft\Windows\DeviceGuard`r`nDeployConfigCIPolicy`r`nDWORD:1`r`n`r`nComputer`r`nSOFTWARE\Policies\Microsoft\Windows\DeviceGuard`r`nConfigCIPolicyFilePath`r`nSZ:C:\\WL\\politicas\\DeviceGuardPolicy.bin"

$NewText="Computer`r`nSOFTWARE\Policies\Microsoft\Windows\DeviceGuard`r`nDeployConfigCIPolicy`r`nDELETE`r`n`r`nComputer`r`nSOFTWARE\Policies\Microsoft\Windows\DeviceGuard`r`nConfigCIPolicyFilePath`r`nDELETE"

((Get-Content -path $LGPOTxt -Raw) -replace $TextToBeReplaced,$NewText) | Set-Content -Path $LGPOTxt

LGPO.txt contains this what I have to change is this string for the other in order to apply the new LGPO policy

; ----------------------------------------------------------------------
; PARSING Computer POLICY
; Source file:  C:\WL\LGPO\LGPOBackUp\DomainSysvol\GPO\Machine\registry.pol

Computer
SOFTWARE\Policies\Microsoft\Windows\DeviceGuard
DeployConfigCIPolicy
DWORD:1

Computer
SOFTWARE\Policies\Microsoft\Windows\DeviceGuard
ConfigCIPolicyFilePath
SZ:C:\\WL\\politicas\\DeviceGuardPolicy.bin

; PARSING COMPLETED.
; ----------------------------------------------------------------------

Any way to do this?

marcosagni98 · Accepted Answer · 2021-09-21 07:12:24Z

8

This is because -replace operator treats replacement text as regular expression.

<input> -replace <regular-expression>, <substitute>

Instead, you could use replace method on the string object.

(Get-Content -path $LGPOTxt -Raw).replace($TextToBeReplaced, $NewText) | Set-Content -Path $LGPOTxt

edited Sep 21, 2021 at 7:12

marcosagni98

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answered Sep 21, 2021 at 6:54

user459872

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7 Comments

marcosagni98 Over a year ago

it doesnt changed it I applied just like you did

marcosagni98 Over a year ago

it seems is not working because is in several lines, but i want to keep that text structure

user459872 Over a year ago

Can you update the question with sample $LGPOTxt file content?

marcosagni98 Over a year ago

I updated, adding the content of the txt

mklement0 Over a year ago

Nice, though it's worth noting that the [string] type's .Replace() method is case-sensitive, unlike PowerShell's -replace operator. In Windows PowerShell, this cannot be helped; in PowerShell (Core) 7+, there is a new overload that allows case-insensitivity as an opt-in.

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