C# 正则表达式实例

using System;
using System;
using System.Text.RegularExpressions;


namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            string pattern;
            //pattern = @"^([1-9]\d{0,2}|5000|[1-4]\d{3})$";//1到5000整数包括1和5000
            //pattern = @"^((?:[1-9]\d{0,2}|[1-4]\d{3})((\.\d+)*)|(5000(\.[0]+)*))$";//1到5000小数包括5000.0*
            //pattern = @"^(1(\.0+)*|(0(.\d+)?))$";//0到1 小数包括0和 1 
            pattern = @"^(([1-9]|\d{2,3}|10[0-1]\d|102[1-4])|0)?$";//0到1024的整数包括0和1024
            pattern = @"^(0|(10[0-1]\d)|102[0-4]|([1-9]([1-9])?[1-9]?))?$";//0到1024的整数包括0和1024
            //pattern = @"^(([1-2](\.\d+)?)|(0\.[6-9][0-9]+)|3(\.0+)*|(0.60*))?$";//0.6~3.0


            //pattern = @"^(-3(\.0+)*|-3(\.[0]\d*)|-3(\.1)*|-3(\.1[0-3]\d*)|-3(\.140*))?$";
            //pattern = @"^(3(\.0+)*|3(\.[0]\d*)|3(\.1)*|3(\.1[0-4]\d*)|3(\.150*))?$";
            //pattern = @"^(((-3(\.0+)*|-3(\.[0]\d*)|-3(\.1)*|-3(\.1[0-3]\d*)|-3(\.140*))|(-?[0-2](\.\d+)*))|(3(\.0+)*|3(\.[0]\d*)|3(\.1)*|3(\.1[0-4]\d*)|3(\.150*)))?$";

            while (true)
            {
                var str = Console.ReadLine();
                foreach (Match match in Regex.Matches(str, pattern))
                    Console.WriteLine(match.Value);
            }
            //Console.ReadKey();
            
        }
        
    }
}

pattern = @"^(((-3(\.0+)*|-3(\.[0]\d*)|-3(\.1)*|-3(\.1[0-3]\d*)|-3(\.140*))|(-?[0-2](\.\d+)*))|(3(\.0+)*|3(\.[0]\d*)|3(\.1)*|3(\.1[0-4]\d*)|3(\.150*)))?$"

pattern = @"^(([1-2](\.\d+)?)|(0\.[6-9][0-9]+)|3(\.0+)*|(0.60*))?$";//0.6~3.0

pattern = @"^(0|(10[0-1]\d)|102[0-4]|([1-9]([1-9])?[1-9]?))?$";//0到1024的整数包括0和1024

 pattern = @"^(([1-9]|\d{2,3}|10[0-1]\d|102[1-4])|0)?$";//0到1024的整数包括0和1024

pattern = @"^([1-9]\d{0,2}|5000|[1-4]\d{3})$";//1到5000整数包括1和5000

pattern = @"^(1(\.0+)*|(0(.\d+)?))$";//0到1 小数包括0和 1