csharp CS：解码引用具有特定编码的可打印文本

Posted 2021-05-12

String DecodeQuotedPrintable(String input, Encoding encoding = null)
{
    encoding = encoding ?? Encoding.UTF8;

    var decoded = Regex.Replace(input, @"=([0-9a-fA-F]{2})|=\r\n",
                    m => m.Groups[1].Success
                         ? Convert.ToChar(Convert.ToInt32(m.Groups[1].Value, 16)).ToString()
                         : "");
    
    var rawBytes = decoded.Select(Convert.ToByte).ToArray();
    
    return encoding.GetString(rawBytes);
}