package regex;import java.util.Scanner;import java.util.regex.Matcher;import java.util.regex.Pattern;public class registered {public static void main(String[] args) {//注冊用戶Scanner sc=new Scanner(System.in);System.out.println("請輸入用戶名：");String uname=sc.next();System.out.println("請輸入密碼：");String passwd=sc.next();System.out.println("請輸入確認密碼：");String repasswd=sc.next(); /* String uname="wangheng";String passwd="222assAS123";String repasswd="432Pass123";*/ boolean b=uname.matches("//w{3,10}"); //方法一if(b==true){Pattern p0=Pattern.compile(".{6,12}");//長度6到12個Pattern p1=Pattern.compile(".*[A-Z]+");//Pattern p2=Pattern.compile(".*[a-z]+");Pattern p3=Pattern.compile(".*//d+");Matcher m0=p0.matcher(passwd);Matcher m1=p1.matcher(passwd);Matcher m2=p2.matcher(passwd);Matcher m3=p3.matcher(passwd);if(m0.lookingAt()==true&&m1.lookingAt()==true&& m2.lookingAt()==true&&m3.lookingAt()==true){boolean b2=passwd.matches(repasswd);if(b2){System.out.println("注冊成功！");}else{System.out.println("確認密碼與密碼不同！");}}else{System.out.println("密碼輸入錯誤！");}}else{System.out.println("用戶名輸入錯誤！");}//方法二Pattern p1=Pattern.compile("[A-Z]+");Pattern p2=Pattern.compile("[a-z]+");Pattern p3=Pattern.compile("//d+");Matcher m1=p1.matcher(passwd);Matcher m2=p2.matcher(passwd);Matcher m3=p3.matcher(passwd);if(uname.matches("//w{3,10}")&&passwd.matches(".{6,12}")&&m1.find()&&m2.find()&&m3.find()){System.out.println("注冊成功！");}else{System.out.println("注冊失敗！");}}}