Getting supported sleep states

PowerShell Help
1

Hello everyone,

I’m trying to create a script to list all available sleep states for a device, so I’m running ‘powercfg /a’ and I tried to create a regex expression to extract the lines that interest me and it seems to show what I need → regex101: build, test, and debug regex

But when I run the below code, I don’t get any result - what am I doing wrong here :slight_smile: ?
…
$SleepStates = powercfg /a
$RegexSleepStates = “(?smi)((?<=The following sleep states are available on this system:\n).?$.+?^\n?$)”
select-string -inputobject $SleepStates -Pattern $RegexSleepStates -AllMatches | ForEach-Object { $.Matches } | ForEach-Object { $.Value }
…

2

Hi Karol,

First issue I see if you’re trying to span multiple lines when the input is going to be line by line. Typically you would just make it a single string value rather than an array of strings, but I had weirdness with the output. Probably something to do with the way powershell reencodes the output. So instead of helping fix your attempt, I offer an alternative solution.

$capture = $false

switch -Regex (powercfg /a){
    'The following sleep states are available on this system:' {
        $capture = $true
    }

    '^\s{2,4}(.+$)' {
        if($capture){
            $matches.1
        }
    }

    'The following sleep states are not available on this system:' {$capture = $false}
}

Please give it a try while waiting for others to offer input. If you want to capture the output to a variable just put the variable assignment before the switch statement.

$capture = $false

$MyVariable = switch -Regex (powercfg /a){
    'The following sleep states are available on this system:' {
        $capture = $true
    }

    '^\s{2,4}(.+$)' {
        if($capture){
            $matches.1
        }
    }

    'The following sleep states are not available on this system:' {$capture = $false}
}
3

Hi Doug,

thank you very much for your help!
Your code does exactly what I needed :slight_smile:
The construct you proposed is quite complicated for my current PS/Regex skills, but I’ll go over it a couple of times until I understand it.