Question

我遇到一些问题，使用正则表达式与字母列表中的命名捕获组匹配字符串。

字符串本身是机场METAR（天气预报）：

KLAX 050453Z 33003KT 10SM + TSRAGR HZ BR FEW010 SCT020 21/17 A3001 RMK AO2 SLP161 T02060172

这是我使用的正则表达式：

Regex MetarExpression = new Regex(@"\s(?<intensity>[\+\-VC]{1,2})?(?<descriptor>(MI|PR|BC|DR|BL|SH|TS|FZ))(?<group>(DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS))+\s");

基本上我需要将天气组（在本例中为+ TSRAGR，HZ和BR）重写为各自的翻译，其中包括雷暴，暴雨，冰雹，阴霾，雾气等等。

以下是我目前要进行翻译的代码逻辑：

Match m = MetarExpression.Match(metar);
if (m.Success)
{
    StringBuilder sb = new StringBuilder();

    if(phenom.ContainsKey(m.Groups["descriptor"].Value))
    {
        sb.Append(phenom[m.Groups["descriptor"].Value]);
        sb.Append(", ");
    }

    if (phenom.ContainsKey(m.Groups["intensity"].Value))
    {
        sb.Append(phenom[m.Groups["intensity"].Value]);
        sb.Append(" ");
    }

    foreach (Capture cap in m.Groups["group"].Captures)
    {
        if (phenom.ContainsKey(cap.Value))
        {
            sb.Append(phenom[cap.Value]);
            sb.Append(" ");
        }
    }
    Console.WriteLine(sb);
}

字典：

  static Dictionary<string, string> phenom = new Dictionary<string, string>
  {
      {"-", "Light"},
      {"+", "Heavy"},
      {"VC","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"}
  };

我遇到的问题是它只捕获了第一个天气组（+ TSRAGR），而不是其他两个。

有关如何纠正此问题的任何想法？

Answer 1

如果你想要捕获HZ和BR，请尝试以下，

Regex MetarExpression = new Regex(@"\s(?<intensity>[\+\-VC]{1,2})?(?<descriptor>(MI|PR|BC|DR|BL|SH|TS|FZ))(?<group>(DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS))\s(?<group1>(DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS))\s(?<group2>(DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS))");

因为中间有空格字符，所以它会阻止捕获。您需要指定其他组来捕获HZ和BR。

DEMO

它会单独捕获+TSRAGR HZ BR。

\s(?<intensity>[\+\-VC]{1,2})?(?<descriptor>(MI|PR|BC|DR|BL|SH|TS|FZ))(?<group>(DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS))(?<group1>(DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS))+\s(?<group2>(DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS))\s(?<group3>(DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS))

DEMO

将名为groups的正则表达式与字典键匹配

1 个答案: