如何在C#中拆分数字和字符串

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        string input = "123abc456def789";
        string pattern = @"\d+|\D+"; // 匹配一个或多个数字或非数字字符

        string[] parts = Regex.Split(input, pattern);

        foreach (string part in parts)
        {
            Console.WriteLine(part);
        }
    }
}

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        string input = "123abc456def789";
        List<string> parts = new List<string>();
        StringBuilder number = new StringBuilder();
        StringBuilder text = new StringBuilder();

        foreach (char c in input)
        {
            if (Char.IsDigit(c))
            {
                if (text.Length > 0)
                {
                    parts.Add(text.ToString());
                    text.Clear();
                }
                number.Append(c);
            }
            else
            {
                if (number.Length > 0)
                {
                    parts.Add(number.ToString());
                    number.Clear();
                }
                text.Append(c);
            }
        }

        if (number.Length > 0)
        {
            parts.Add(number.ToString());
        }
        if (text.Length > 0)
        {
            parts.Add(text.ToString());
        }

        foreach (string part in parts)
        {
            Console.WriteLine(part);
        }
    }
}

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        string input = "123abc456def789";
        var parts = input.Split(new char[] { 'a', 'b', 'c', 'd', 'e', 'f' }, StringSplitOptions.RemoveEmptyEntries);

        foreach (string part in parts)
        {
            Console.WriteLine(part);
        }
    }
}