N個連續字符的.NET正則表達式

Question

我需要一個匹配字符串中三個連續字符（任何字母數字字符）的正則表達式。

其中2a82a9e4eee646448db00e3fccabd8c7“eee”將匹配。

其中2a82a9e4efe64644448db00e3fccabd8c7“444”將匹配。

等等

Answer 1

使用反向引用。

([a-zA-Z0-9])\1\1

Answer 2

嘗試這個：

using System;
using System.Text.RegularExpressions;

class MainClass {

    private static void DisplayMatches(string text,
                                       string regularExpressionString) 
    {
        Console.WriteLine("using the following regular expression: " 
                        +regularExpressionString);
        MatchCollection myMatchCollection = 
            Regex.Matches(text, regularExpressionString);

        foreach (Match myMatch in myMatchCollection) {
          Console.WriteLine(myMatch);
        }
    }

    public static void Main() 
    {
        string text ="Missisipli Kerrisdale she";

        Console.WriteLine("Matching words that that contain " 
                          + "two consecutive identical characters");
        DisplayMatches(text, @"\S*(.)\1\S*");
    }
}