如何在C#中解析特定字符串

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        string input = "This is an example string that contains a specific pattern: #12345";

        // 定义正则表达式模式
        string pattern = @"#(\d+)";

        // 创建正则表达式对象
        Regex regex = new Regex(pattern);

        // 执行匹配操作
        Match match = regex.Match(input);

        // 检查是否找到匹配项
        if (match.Success)
        {
            // 提取匹配项中的特定内容
            string matchedValue = match.Value;
            string capturedGroup = match.Groups[1].Value;

            Console.WriteLine("匹配的内容: " + matchedValue);
            Console.WriteLine("提取的组内容: " + capturedGroup);
        }
        else
        {
            Console.WriteLine("未找到匹配项.");
        }
    }
}

匹配的内容: #12345
提取的组内容: 12345