将正则表达式匹配项转换为字符串列表 [英] Convert regex matches to the list of strings

问题描述

我正试图在大约5万个字符串的大列表中找到相等的子字符串，这很好:

I'm trying to find equal sub-string in big list about 50 000 strings, this way fine:

var results = myList.FindAll(delegate (string s) { return s.Contains(myString); });

但是它还会查找带有单词一部分的子字符串，例如，如果我正在寻找"you do"，它还会发现额外的"you dont"，因为其中包含"you do ..".

but it also looks for sub-string with part of word, for example, if I'm looking for "you do" it founds also extra "you dont" because contains "you do..".

因此，我对上一个问题的答案应该可以用根据我的需要，但是我不确定如何从正则表达式匹配中获取特定代码的字符串列表:

So, this answer to my previous question supposedly should work as i need, but I'm not sure, how to get strings list from regex matches for particular code:

foreach (string phrase in matchWordsList)
{
     foreach (string str in bigList)
     {
          string[] stringsToTest = new[] { phrase };
          var escapedStrings = stringsToTest.Select(s => Regex.Escape(s)); 
          var regex = new Regex("\\b(" + string.Join("|", escapedStrings) + ")\\b");
          var matches = regex.Matches(str);

          foreach (string result in matches) /// Incorrect: System.InvalidCastException 
          {
              resultsList.Add(result);
          }
     }
}

直接从matches获取字符串到list会引发异常:

Getting strings from matches directly to the list throws exception:

发生类型为'System.InvalidCastException'的未处理的异常 在test.exe中

An unhandled exception of type 'System.InvalidCastException' occurred in test.exe

其他信息:无法转换类型的对象 "System.Text.RegularExpressions.Match"键入"System.String".

Additional information: Unable to cast object of type 'System.Text.RegularExpressions.Match' to type 'System.String'.

所以，我正在尝试找出将var matches = regex.Matches(str);转换为列表的方法

So, I'm trying to figure out, hot to convert var matches = regex.Matches(str); to the list

推荐答案

您可以使用linq做到这一点.但是，您需要先Cast，然后再Select

You can do it with linq. However you will need to Cast it first then Select

var resultsList = regex.Matches(str)
                       .Cast<Match>()
                       .Select(m => m.Value)
                       .ToList();

或

someList.AddRange(
   regex.Matches(str)
         .Cast<Match>()
         .Select(m => m.Value));

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