$row = 'wxyz012345BCDEFG';
$col = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

$encryptWords = -join(@(for ($i = 32; $i -le 122; $i++) { [char]$i }));

function GetDecryptWord([string]$str){
	if($str.Length -ne 4) { return '';}
	$char1 = $str[2];
	$char2 = $str[3];
	[int]$index1 = $col.IndexOf($char1);
	[int]$index2 = $row.IndexOf($char2);
	[int]$id = ($index1 - 8) * 4 + $index2;
	if($char2 -cmatch "[BCDEFG]"){$id -= 4;}
	return $encryptWords[$id];
}

# 加密的链接
$url = 'JTY4JTc0JTc0JTcwJTczJTNBJTJGJTJGJTc2JTZGJTY0JTMyJTJFJTYyJTc1JTc5JTYzJTYxJTcyJTM1JTJFJTYzJTZFJTJGJTMyJTMwJTMyJTMwJTMxJTMyJTMxJTM5JTJGJTQ1JTM1JTc4JTQxJTY1JTUzJTZEJTY3JTJGJTY5JTZFJTY0JTY1JTc4JTJFJTZEJTMzJTc1JTM4';

# 解密输出
$result = [regex]::Replace($url, '(?:JT\w\w)',{GetDecryptWord -str $args.value});
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