Regex on Powershell script: Replace till end of line

Question

I have some config files structured like:

PATH_KEY=C:\\dir\\project

foo=bar

I want to write a small script that replaces a certain key with current folder. So basically I'm trying to replace "PATH_KEY=..." with "PATH_KEY=$PSScriptRoot"

My code so far:

$cfgs = Get-Childitem $PSScriptRoot -Filter *name*.cfg

foreach ($cfg in $cfgs) 
{
  (  Get-Content $cfg) -replace 'PATH_KEY=.*?\n','PATH_KEY=$PSScriptRoot' | Set-Content $cfg
}

But the regular expression to take everything till end of line is not working. Any help is appreciated!

*is not working* how? Why not use a mere `'(?m)^PATH_KEY=.*'` or even `'PATH_KEY=.*'`? — Wiktor Stribiżew, May 09 '16 at 09:25
thanks it worked. only thing now is that $PSScriptRoot is not using double backslash... — kerosene, May 09 '16 at 10:18
What do you mean by a double backslash? There is no backslash in `$PSScriptRoot`. — Wiktor Stribiżew, May 09 '16 at 10:25
echo $PSScriptRoot -> C:\something echo $PSScriptRoot.replace('\','\\') -> C:\\something — kerosene, May 09 '16 at 12:22
Do you mean you are trying to expand `$PSScriptRoot` variable inside a replacement string? It is not correct. You need to [provide a callback](http://stackoverflow.com/questions/8163061/passing-a-function-to-powershells-replace-function). — Wiktor Stribiżew, May 09 '16 at 12:55
Just in case: `[regex]::Replace($str,'PATH_KEY=.*',{param($match) "PATH_KEY=$($PSScriptRoot.replace("\","\\"))"})` — Wiktor Stribiżew, May 10 '16 at 08:55

score 1 · Accepted Answer · answered May 09 '16 at 10:27

1

You can use

'(?m)^PATH_KEY=.*'

or even

'PATH_KEY=.*'

Note that $ in the replacement should be doubled to denote a single $, but it is not a problem unless there is a digit after it.

See the demo:

answered May 09 '16 at 10:27

Wiktor Stribiżew

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Regex on Powershell script: Replace till end of line

1 Answers1