Regular expression

Acronym
Acronym in PowerShell 
Function Get-Acronym() {
    [CmdletBinding()]
    Param (
        [string]$Phrase
    )
    (-join ([regex]::Matches($Phrase, "\p{L}+'?\p{L}*") | ForEach-Object { $_.Value[0] })).ToUpper()
}

This approach use the regex class from .NET to match potential words inside the phrase using a specific pattern.

[regex]::Matches($Phrase, "\p{L}+'?\p{L}*")

The pattern match any regular word and those that have apostrophe inside it, for example doesn't or Halley's in a test case. We then collect the matched objects and loop over them, extracting the match value first index, which is the first char of each word.

ForEach-Object { $_.Value[0] }

Then we call the -join operator upon the collection to turn this into a string, and then call the string method .ToUpper() to make sure it is all in uppercase to fit with acronym behavior.

Regex expression for .NET

11th Sep 2024 · Found it useful?

Other Approaches to Acronym in PowerShell

Other ways our community solved this exercise
Function Get-Acronym() {
    [CmdletBinding()]
    Param (
        [string]$Phrase
    )
    ( $Phrase -replace "[-_]"," " -split " " | Foreach-Object {$_[0].ToString().ToUpper()} ) -join ""
}
String methods

Approach using various string methods 

foreach ($char in $Phrase.ToCharArray()) {
    if ($newWord -and $char -match "[a-z]") {
        $acronym += $char
        $newWord = $false
    }
    if (-not $newWord -and $char -match "[_\- ]") {
        $newWord = $true
    }
Loop and boolean

Approach using foreach loop and boolean flag