第五次作业

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

namespace ConsoleApplication7
{
class Program
{
static void Main(string[] args)
{
string s1 = "One Two Three Four"; string sx = (string)s1.Clone(); //s1复制到sx

Console.WriteLine(Object.ReferenceEquals(s1, sx)); //相同返回true sx += " Five";//sx修改

Console.WriteLine(Object.ReferenceEquals(s1, sx)); // 不同返回False

Console.WriteLine(sx); // 显示"One Two Three Four Five"

//Console.ReadLine();

string s2 = "pppp";
int result;
result = string.Compare(s1, s2);//逐个比较其Unicode值
Console.WriteLine(result);
//Console.ReadLine();

s2 = s1.Substring(0, 3);//提取One 赋值给s2
Console.WriteLine(s2);
//Console.ReadLine();

string words = "One,Two,Three Liberty Associates, Inc.";
string[] splitedString = words.Split(' ', ',');//每当有空格和逗号的时候取出来丢进splitedString数组中

foreach (string s in splitedString)

{

Console.WriteLine(s);

}
string s3 = "One,Two,Three Liberty Associates, Inc.";

Regex theRegex = new Regex(" |, |,");

StringBuilder sBuilder = new StringBuilder();

int id = 1;

foreach(string subString in theRegex.Split(s3))

{

sBuilder.AppendFormat("{0}: {1}\n", id++, subString);

}

Console.WriteLine("{0}", sBuilder);//正则表达式 Console.ReadLine();
}
}
}