PowersShell UpperCase Replace - powershell

Question

Ok... after 99 different combinations...
I want to replace in thousands of files all occurences of EnumMessage.something to EnumMessage.SOMETHING so uppercase the second word. Which may be standalone or followed by a dot or followed by a (
$output = 'EnumMessage.test(something) and EnumMessage.Tezt andz EnumMessage.ALREAdY. ' -creplace 'EnumMessage\.(\w+)', 'EnumMessage.$1.ToUpper()'
$output
So the above places the function Upper there (the word) but it does not upper the second word.

Answer 1

In PowerShell 6 and later, the -replace operator also accepts a script block that performs the replacement. The script block runs once for every match.
In PowerShell 5, apply the Regex.Replace Method.
$string = 'EnumMessage.test(something) and EnumMessage.Tezt andz EnumMessage.ALREAdY. '
$pattern = '(?<=EnumMessage\.)(\w+)'
# (?<=EnumMessage\.) = positive lookbehind
if ( $PSVersionTable.PSVersion.Major -ge 6 ) {
$string -replace $pattern, { $_.Value.ToUpper() }
} else {
[regex]::Replace( $string, $pattern, { $args.Value.ToUpper() } )
}

Answer 2

There are definitely some challenges. I'm really not the best at RegEx. Any time I tried to leverage the $matches collection I was only able to replace the first match. There's probably something I'm forgetting about that functionality. However, I was able to cook up the below:
[RegEx]::Matches($String, '(?<=EnumMessage\.)\w+') |
ForEach-Object{
$Replace = $String.Substring($_.Index, $_.Length).ToUpper()
$String = $String.Remove($_.Index, $_.Length)
$String = $String.Insert($_.Index, $Replace)
}
$String
Note: I used a RegEx lookbehind, but I'm not positive that had much to do with the outcome.
The .Net [RegEx] class returned objects with the location of the matches in the string so I used that to strategically remove then add the ucased strings. Which should return: EnumMessage.TEST(something) and EnumMessage.TEZT andz EnumMessage.ALREADY.