有一个正则表达式的味道，让我来算匹配由重复的次数 * 和 + 运营商？我特别想知道，如果可能的.NET平台下。

Is there a regex flavor that allows me to count the number of repetitions matched by the * and + operators? I'd specifically like to know if it's possible under the .NET Platform.

推荐答案

您很幸运，因为实际上.NET正则表达式做到这一点（我认为这是很独特）。基本上在每一个匹配，每个集团商店每捕获的写了。

You're fortunate because in fact .NET regex does this (which I think is quite unique). Essentially in every Match, each Group stores every Captures that was made.

所以，你可以指望有多少次重复的图案由匹配输入：

So you can count how many times a repeatable pattern matched an input by:

使其成为一个捕获组 在计数多少捕获由该组中的每场比赛都取得了 您可以通过个人的捕获循环太多，如果你想要的！ Making it a capturing group Counting how many captures were made by that group in each match You can iterate through individual capture too if you want!

下面是一个例子：

Regex r = new Regex(@"b(hu?a)+b");

var text = "hahahaha that's funny but not huahuahua more like huahahahuaha";
foreach (Match m in r.Matches(text)) {
   Console.WriteLine(m + " " + m.Groups[1].Captures.Count);
}

此照片（因为看到ideone.com ）：

hahahaha 4
huahuahua 3
huahahahuaha 5

API参考

CaptureCollection