C# split与正则表达式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
namespace ConsoleApplication9
{
    class Program
    {
        static void Main(string[] args)
        {
            /*  //已验证
           string str = @"0379-65620543";
           Regex rgx = new Regex(@"0\d{2,3}-\d{6,8}");
           Regex rgx1 = new Regex(@"^0");  //以0开头
           Regex rgx2 = new Regex(@"3$");  //以3结尾
           Console.WriteLine(rgx2.IsMatch(str));
           */
            /*  //已验证
             string[] str = { @"[phone]", @"0379-65620543" };
             Regex rgx = new Regex(@"0\d{2,3}-\d{6,8}|\(0\d{2,3}\)\d{7,8}");//注意括号要转义
             Console.WriteLine(rgx.IsMatch(str[0]));
             Console.WriteLine(rgx.IsMatch(str[1]));
             */
            /* //已验证
           string str = @"asdfgsfsasdghdjgfadsdsdgjd";
           Regex rgx = new Regex(@"sd");
           Console.WriteLine(rgx.Matches(str).Count);  //4
           */

            /* //已验证
            string str = @"asdfgsfsasdghdjgfadsdsdgjd";
            Regex rgx = new Regex(@"sd");
            Console.WriteLine(rgx.Replace(str,@"_"));  //a_fgsfsa_ghdjgfad__gjd  把所有sd变成_
            */
            /*
            string str = @"asdfgsfsasdghdjgfadsdsdgjd";
            Regex rgx = new Regex(@"a");
            string[] s = rgx.Split(str);
            foreach(var i in s)
            {
                Console.WriteLine(i);
            }
            */
            string str = @"0379-65620543";
            Regex rgx = new Regex(@".*");
            Console.WriteLine(rgx.IsMatch(str));
        }
   }
}