PS deobfuscator

$str = Read-Host

switch -Regex ($str.Replace('^','')) {
    ("(set.+)&") {$cmds = $matches[1].split('&')}
}

$pstr = $cmds[0]

for ($i = 1;$i -lt $cmds.Length;$i++) {
    if ($cmds[$i].length -ne 0) {
        switch -Regex ($cmds[$i]) {
                ":(.)=(.)!" {$vars = $matches}
        }
        $pstr = $pstr -creplace [regex]::escape($vars[1]), [regex]::escape($vars[2])
    }
}

$decode = [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($pstr.split(' ')[-1]))

switch -Regex ($decode) {
    "\('(.)'\)" {$split = $matches[1]}
    "'(.*)'" {($matches[1].split("'"))[0].split($split)}
}