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package com.yzy;
import java.util.regex.*;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
Pattern p=Pattern.compile("^[a-z]+");
Matcher m=p.matcher("a233"); //true
//Matcher m=p.matcher("2233") ......
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import java.net.*;
import java.io.*;
public class Client {
static Socket server;
public static void main(String[] args) throws Exception {
server = new Socket(InetAddress.getLocalHost(), 23);
BufferedReader in = new BufferedReader(new InputStreamReader ......