C# 带有字典键的正则表达式匹配

我正在扩展我以前问过的问题

在我解释之前，这里是我的C代码：

静态字典现象=新字典
{
{-”，“光”}，
{\\+，“重”}，
{“\bVC\b”，“在附近”}，
//描述符
{“米”，“浅”}，
{“PR”，“Partial”}，
{“BC”，“补丁”}，
{“DR”，“低漂移”}，
{“BL”，“吹”}，
{“SH”，“阵雨”}，
{“TS”，“雷雨”}，
{“FZ”，“冻结”}，
//沉淀
{“DZ”，“毛毛雨”}，
{“拉”，“雨”}，
{“SN”，“Snow”}，
{“SG”，“雪粒”}，
{“IC”，“冰晶”}，
{“PL”，“冰粒”}，
{“GR”，“Hail”}，
{“GS”，“小冰雹/雪球”}，
{“向上”，“Uknown降水”}，
//模糊
{“BR”，“Mist”}，
{“FG”，“Fog”}，
{“福”，“烟”}，
{“VA”，“火山灰”}，
{“DU”，“广泛的灰尘”}，
{“SA”，“Sand”}，
{“HZ”，“Haze”}，
{“PY”，“Spray”}，
//其他
{“PO”，“发育良好的灰尘/沙尘漩涡”}，
{“SQ”，“飑”}，
{“FC”，“漏斗云龙卷风水龙卷”}，
{“SS”，“沙尘暴”}，
{“DS”，“沙尘暴”}
};
公共静态字符串进程（字符串元）
{
metar=Regex.Replace（metar，”（？根据代码的结构，我建议对输入字符串进行预解析，将强度指示器“移动”到它们不修改的术语之后，以便按照最有意义的顺序出现单词

太长了，读不下去了，我可以考虑在你的字典里加几个键来覆盖每种类型的降水的+/-版本，这样就可以简化你的总体代码了。< /P> TL；DR你能给我们简短的版本吗？你需要一个正则表达式来解释什么？为什么不定义正则表达式来提取你想要的而不是篡改I？输入字符串？
static Dictionary<string, string> phenom = new Dictionary<string, string> 
{
    {"-", "Light"},
    {"\\+", "Heavy"},
    {"\bVC\b","In the Vicinity"},
    // descriptor
    {"MI","Shallow"},
    {"PR","Partial"},
    {"BC","Patches"},
    {"DR","Low Drifting"},
    {"BL","Blowing"},
    {"SH","Showers"},
    {"TS","Thunderstorm"},
    {"FZ","Freezing"},
    // precipitation
    {"DZ","Drizzle"},
    {"RA","Rain"},
    {"SN","Snow"},
    {"SG","Snow Grains"},
    {"IC","Ice Crystals"},
    {"PL","Ice Pellets"},
    {"GR","Hail"},
    {"GS","Small Hail/Snow Pellets"},
    {"UP","Uknown Precipitation"},
    // obscuration
    {"BR","Mist"},
    {"FG","Fog"},
    {"FU","Smoke"},
    {"VA","Volcanic Ash"},
    {"DU","Widespread Dust"},
    {"SA","Sand"},
    {"HZ","Haze"},
    {"PY","Spray"},
    // other
    {"PO","Well-Developed Dust/Sand Whirls"},
    {"SQ","Squalls"},
    {"FC","Funnel Cloud Tornado Waterspout"},
    {"SS","Sandstorm"},
    {"DS","Duststorm"}
};

public static string Process(String metar)
{
    metar = Regex.Replace(metar, "(?<=A[0-9]{4}).*", "");
    StringBuilder _string = new StringBuilder();

    var results = from result in phenom
                  where Regex.Match(metar, result.Key, RegexOptions.Singleline).Success
                  select result;

    foreach (var result in results)
    {
        if (result.Key == "DZ" || result.Key == "RA" || result.Key == "SN" || result.Key == "SG" || result.Key == "PL")
        {
            switch (result.Key)
            {
                case "+":
                    _string.Append("Heavy ");
                    break;
                case "-":
                    _string.Append("Light");
                    break;
                case "VC":
                    _string.Append("In the Vicinity ");
                    break;
                default:
                    break;
            }
        }

        _string.AppendFormat("{0} ", result.Value);
    }

    return _string.ToString();
}