Convert a text ($colors) full of hex colors to a GIMP Palette/gpl file, for Inkscape

hex-to-inkscape-gpl.ps1

$colors = @"
#333333
#222222
#FFFFFF #444433
"@

$theme = "mytheme"
$lns = @("GIMP Palette","Name: $theme","#")

$cregx = [Regex]::new("#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})[^a-fA-F0-9]")
function cc { param($hex) [System.Convert]::ToInt16($hex.ToUpper(), 16);}
foreach ($color in $cregx.Matches($colors)) { 
    $gr = ($color.Groups[1].Value,$color.Groups[2].Value,$color.Groups[3].Value)
    
    
    $lns += ("{0,3} {1,3} {2,3} #{3}" -f (cc $gr[0]),(cc $gr[1]),(cc $gr[2]), ($gr -join ""))
} 
# C:\Program Files\Inkscape\share\inkscape\palettes but might not be direct writeable by ps1
$out = Join-Path -Path  "C:\d\" -ChildPath ("$theme.gpl")
$textout = $lns -join "`n" 
$textout | set-content -Path $out