Loop to replace c:\, d:\ ... z:\ with \\servername\c$\ - powershell

Question

I'm actually trying to build some code to identify rights on shared folders in every single server I've got in my enterprise.
For now, I've already listed every single server and exported it in a .txt file, did a loop on this .txt to export in an other .txt file all shared folders.
All this is working fine but the path is like : c:\...\...\folder$.
To be able to use this I need to do a loop to replace c:\ d:\ etc. with \\servername\c$\.
I've tried using [system.io.file]::ReadAllText and WriteAllText, it's working fine for one letter but didn't find a way to do a loop on it.
I've tried
get-content ... -replace "c:\","\\$ServerName\c$\" ` -replace "d:\" ...
but got an error about regular expression not valid, so trying with [regex]::Escape but didn't work as expected neither...
Powershell
$contenu = [System.IO.File]::ReadAllText("$path\$SharedFolders.txt").Replace("C:\","\\$SharedFolders\c$\")
[System.IO.File]::WriteAllText("$path\$SharedFolders.txt", $contenu)
Powershell
(Get-Content "$path\$SharedFolders.txt") | foreach {
$_ -replace "C:\","\\$SharedFolders\C$\" `
-replace "D:\","\\$SharedFolders\D$\" `
[...] | Set-Content "$path\$sharedfolders.txt"}
And i'd like to have something like that :
Powershell
('a'..'z').ForEach({ (Get-Content "$path\$SharedFolders.txt" -Raw).replace("$_`:\","\\$SharedFolders\$_$") })
But I'm too newbie in Powershell to make it work proprely

Answer 1

You need PSv6 to use 'a'..'z'
The -replace operator is RegEx based, you need to escape a literal backslash with another one in the pattern.
following #Lee_Daileys hint build a RegEx with valid Drive letters
$OFS = '|'
$RE = ('('+(Get-Psdrive -PSProvider filesystem).where({$_.Displayroot -notmatch '^\\'}).name)+'):\\'
$OFS = $Null
"`$RE = '{0}'" -f $RE
'Loop to replace c:\, d:\ … z:\ with \\servername\c$\' -replace $RE,"\\servername\`${1}$\"
Sample output on my PC
$RE = '(A|C|D):\\'
Loop to replace \\servername\c$\, \\servername\d$\ … z:\ with \\servername\c$\
Reading the file with the -raw parameter doesn't require a loop, but wil do all changes at once.
$OFS = '|'
$RE = ('('+(Get-Psdrive -PSProvider filesystem).where({$_.Displayroot -notmatch '^\\'}).name)+'):\\'
$OFS = $Null
$File = "$path\$SharedFolders.txt"
(Get-Content $File -raw) -replace $RE,"\\servername\`${1}$\" |
Set-Content $File

Answer 2

Well thanks for your help, I just manage to make it works like that :
$lecteur=[int][char]'A'
1..26 | % {
$LR=[char]$lecteur
$contenu =[System.IO.File]::ReadAllText("$path\$SharedFolders.txt").Replace("${LR}:\","\\$SharedFolders\$LR$\")
[System.IO.File]::WriteAllText("$path\$SharedFolders.txt", $contenu)
$lecteur++
}
Hope it'll help some people ;)