C#正则表达式如何将用户输入匹配到单词/短语数组 [英] c# regex how to match user's input to an array of words/phrases

问题描述

我有一个包含不同单词和短语的数组.用户将输入垃圾邮件，我应该检查数组中已有的单词和短语是否匹配.对于每个匹配项，得分将为+1，如果得分大于5，则可能是垃圾邮件的可能性是.

I have an array with different words and phrases. The user will input a spam message and I'm supposed to check whether there are any matches to the words and phrases already in the array. For each match the score will +1 and if the score is more than 5 then the possibility of it being a spam message is Yes.

我的分数虽然没有增加，但我不确定为什么.

My score doesn't increase though and I'm not sure why.

string[] spam = new string[] {"-different words and phrases provided by programmer"};

        Console.Write("Key in an email message: ");
        string email = Console.ReadLine();
        int score = 0;

        string pattern = "^\\[a-zA-Z]";
        Regex expression = new Regex(pattern);
        var regexp = new System.Text.RegularExpressions.Regex(pattern);

        if (!regexp.IsMatch(email))
        {
            score += 1;
        }

推荐答案

您可以使用 Linq 解决问题

  // HashSet<String> is for better performance
  HashSet<String> spamWords = new HashSet<String>(
    "different words and phrases provided by programmer"
      .Split(new Char[] {' '}, StringSplitOptions.RemoveEmptyEntries)
      .Select(word => word.ToUpper()));

  ...

  String eMail = "phrases, not words and letters zzz";

  ... 

  // score == 3: "phrases" + "words" + "and"
  int score = Regex
    .Matches(eMail, @"\w+")
    .OfType<Match>()
    .Select(match => match.Value.ToUpper())
    .Sum(word => spamWords.Contains(word) ? 1 : 0);

在此实现中，我以不区分大小写的方式查找垃圾邮件(因此And，and，AND将被视为垃圾邮件).要考虑复数， ings (即word，wording)，您必须使用 stemmer .

In this implementation I'm looking for spam words in case insensitive manner (so And, and, AND will be count as spam words). To take plurals, ings (i.e. word, wording) into account you have to use stemmer.

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