PowerShell elevated relaunch with noexit

Function Test-IsAdminElevated {
    if (([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::
            GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
            return $true
        }
        else {
            return $false
        }
}

# Re-launch with admin elevation and -NoExit

# Match "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass -NoExit -File
# Bit safer in case there are some file names that incorrectly flag a match

$stripRegex = '^[^\s]+(\s-[^\s]+(?:\s[^\s]+)?)+'
$noExitSwitchPresent = $false

if ([System.Environment]::CommandLine -match $stripRegex) {
    if ($Matches[0] -match '-NoExit') {
        $noExitSwitchPresent = $true
    }
}

if (!(Test-IsAdminElevated) -or !($noExitSwitchPresent)) {
    
    $newPSProcess = New-Object System.Diagnostics.ProcessStartInfo 'PowerShell'
    
    $newPSArguments = '-ExecutionPolicy Bypass'
    
    if (!($noExitSwitchPresent)) {
        $newPSArguments += ' -NoExit'
    }

    if (!(Test-IsAdminElevated)) {
        $newPSProcess.Verb = 'RunAs'
    }

    $newPSArguments += " -File `"$($Script:MyInvocation.MyCommand.Path)`""

    $newPSProcess.Arguments = $newPSArguments
    $newPSProcess.WorkingDirectory = Split-Path($Script:MyInvocation.MyCommand.Path) -Parent

    [System.Diagnostics.Process]::Start($newPSProcess)
    
    exit
}