Solved

PowerShell Special Characters In Text String

Posted on 2016-08-08
3
322 Views
Last Modified: 2016-08-10
I am trying to run the PowerShell script below to replace a couple of characters in a file but this script will not work with special characters,  It works fine if I try to replace characters like 'abc' instead of replacing characters like '['.  How can I make PowerShell treat the bracket characters the same way it treats all other characters?

#  Replace brackets and double pipe with a single pipe character.
$original_file = 'C:\TestIn.txt'
$destination_file =  'C:\TestOut.txt'
(Get-Content $original_file) | Foreach-Object {
    $_ -replace '[', '|' `
       -replace ']', '|' `
       -replace '||', '|'
    } | Set-Content $destination_file
0
Comment
Question by:LesterJebson
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 45

Expert Comment

by:aikimark
ID: 41747985
escape the special characters
0
 
LVL 40

Accepted Solution

by:
footech earned 500 total points
ID: 41748036
The -replace operator searches for match using regular expressions, so as aikimark mentioned you need to escape any characters which have special meaning in regex syntax.

The escape character is a backslash "\".  So for your specific example you would use '\['.  The closing bracket ']' can be matched either escaped or not.

One method you can use the [regex]::Escape static method, which will generate a regex string while escaping any possible special characters.
[regex]::Escape('3ksli[[kek]$-*')

Final thing to mention is that you could construct your own regex pattern to match a number of things.  The below would match any of '[', ']', '||' and replace it with "|".
$_ -replace "\[|]|\|\|", "|"

Open in new window

0
 

Author Closing Comment

by:LesterJebson
ID: 41750663
Thank you Footech!  I added the backslash as you suggested.  Then the script ran perfectly.
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to record audio from input sources to your PC – connected devices, connected preamp to record vinyl discs, streaming media, that play through your audio card: Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10 – both 32 bit & 64.
The Windows functions GetTickCount and timeGetTime retrieve the number of milliseconds since the system was started. However, the value is stored in a DWORD, which means that it wraps around to zero every 49.7 days. This article shows how to solve t…
In this fourth video of the Xpdf series, we discuss and demonstrate the PDFinfo utility, which retrieves the contents of a PDF's Info Dictionary, as well as some other information, including the page count. We show how to isolate the page count in a…
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.

735 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question