如何删除MatchCollection中的重复匹配项 [英] How to Remove Duplicate Matches in a MatchCollection

问题描述

在我的MatchCollection中，我得到了同一件事的匹配项.像这样:

In my MatchCollection, I get matches of the same thing. Like this:

string text = @"match match match";
Regex R = new Regex("match");
MatchCollection M = R.Matches(text);

如何删除重复的匹配项，这是最快的方法吗?

How does one remove duplicate matches and is it the fastest way possible?

此处假定重复"表示匹配项包含完全相同的字符串.

推荐答案

Linq

如果您使用的是.Net 3.5或更高版本(例如4.7)，则可以使用linq删除匹配项的重复项.

Linq

If you are using .Net 3.5 or greater such as 4.7, linq can be used to remove the duplicates of the match.

string data = "abc match match abc";

Console.WriteLine(string.Join(", ", 

Regex.Matches(data, @"([^\s]+)")
     .OfType<Match>()
     .Select (m => m.Groups[0].Value)
     .Distinct()

));

// Outputs abc, match

---

.Net 2或否Linq

将其放入hastable中，然后提取字符串:

---

.Net 2 or No Linq

Place it into a hastable then extract the strings:

string data = "abc match match abc";

MatchCollection mc = Regex.Matches(data, @"[^\s]+");

Hashtable hash = new Hashtable();

foreach (Match mt in mc)
{
    string foundMatch = mt.ToString();
    if (hash.Contains(foundMatch) == false)
        hash.Add(foundMatch, string.Empty);

}

// Outputs abc and match.
foreach (DictionaryEntry element in hash)
    Console.WriteLine (element.Key);

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