How to replace a regular exepresion in a string in power shell

Question

Hi,
Not able to replace "\X25" with "%" in powershell script.
$new = $inst1
$word = '\X25'
also tried
$word = "\X25"
$replacement = "%"
$newText = $new -replace $word,$replacement
following error has been occurred:
The regular expression pattern \X25 is not valid.
At C:\TWClient-Build\rgx.ps1:15 char:1
+ $newText = $new -replace $word,$replacement
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (\X25:String) [], RuntimeException
    + FullyQualifiedErrorId : InvalidRegularExpression
Thank You

Answer 1

As noted in other posts, it's failing because the '\' is a reserved character and needs to be escaped.  There are other reserved characters that will also need to be escaped if you need to match them in your regular expression.
The [regex] class offers an static Escape() method that you can use to help you escape the reserved characters when doing a literal match:
$find = '\X25'
$Regex = [regex]::Escape($find)
$Regex
\\X25
[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "