java使用正则表达式对注册页面进行验证

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) {
//注册用户
Scanner sc=new Scanner(System.in);
System.out.println("请输入用户名：");
String uname=sc.next();
System.out.println("请输入密码：");
String passwd=sc.next();
System.out.println("请输入确认密码：");
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}");//长度6到12个
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("注册成功！");
}else{
System.out.println("确认密码与密码不同！");
}
}else{
System.out.println("密码输入错误！");
}
}else{
System.out.println("用户名输入错误！");
} //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("注册成功！");
}else{
System.out.println("注册失败！");
}
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//方法三

 String regex="^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).{6,15}$";
           System.out.println(passwd.matches(regex));

}
}