Replace first character in PowerShell

Question

I have to replace the first character in a string. I have a snippet like this:

 if(!([string]::Compare($filestmp.Substring(0,1), "M", $True)))
 {
     echo cos
     $filestmp = $filestmp.Replace('^(.*?)M(.*)', 'Zmodyfikowany  ')
 }

The code doesn't throw any exceptions, and it doesn't work either. The if condition passes, since my echo statement is printed. What am I doing wrong here?

What are you trying to do ? why do you have a regular expression in your code ? How do your string look before replacing ? and how do you want it after ? — Prageeth Saravanan
– Prageeth Saravanan, Commented Dec 22, 2016 at 15:07
String.Replace() doesn't support regex, use the -replace operator or Regex.Replace() — Mathias R. Jessen
– Mathias R. Jessen, Commented Dec 22, 2016 at 15:12
My string looks for example "M log.txt" and I want to receive "Zmodyfikowany log.txt" — MykeDev
– MykeDev, Commented Dec 22, 2016 at 15:20

Peter Mortensen · Accepted Answer · 2019-03-28 21:20:11Z

4

RegEx is overkill.

Use a simple substring:

$filestmp=("Zmodyfikowany" +  $filestmp.SubString(1) )

edited Mar 28, 2019 at 21:20

Peter Mortensen

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answered Dec 22, 2016 at 15:11

Christopher G. Lewis

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Comments

Peter Mortensen · Accepted Answer · 2019-03-28 21:21:35Z

0

Other solution:

$filestmp = "M Log.txt"

# Test equal which ignores case
if ($filestmp.Substring(0,1) -ieq "M")
{
    $filestmp = "'Zmodyfikowany{0}" -f  $filestmp.Substring(1)
}

# Test like which ignores case
if ($filestmp -ilike "M*")
{
    $filestmp = "'Zmodyfikowany{0}" -f  $filestmp.Substring(1)
}

edited Mar 28, 2019 at 21:21

Peter Mortensen

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answered Dec 23, 2016 at 8:30

Esperento57

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