如何在c#中提取一串文本

using System;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        string input = "这是一段文本，包含了一些数字，如123和456。";
        string pattern = @"\d+";
        MatchCollection matches = Regex.Matches(input, pattern);

        foreach (Match match in matches)
        {
            Console.WriteLine(match.Value);
        }
    }
}

using System;

public class Program
{
    public static void Main()
    {
        string input = "这是一段文本，包含了一些数字，如123和456。";
        string[] words = input.Split(' ', '，');

        foreach (string word in words)
        {
            if (word.All(char.IsDigit))
            {
                Console.WriteLine(word);
            }
        }
    }
}