（转）求正则表达式，密码必须包含大写字母、小写字母、数字

import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class RegexRegexTest2 {
    public static boolean checkPassword(String password){
        if(password.matches("\\w+")){
            Pattern p1= Pattern.compile("[a-z]+");
            Pattern p2= Pattern.compile("[A-Z]+");
            Pattern p3= Pattern.compile("[0-9]+");
            Matcher m=p1.matcher(password);
            if(!m.find())
                return false;
            else{
                m.reset().usePattern(p2);
                if(!m.find())
                    return false;
                else{
                    m.reset().usePattern(p3);
                    if(!m.find())
                        return false;
                    else{
                        return true;
                    }
                }
            }
        }else{
            return false;
        }

    }

    public static void main(String[] args) {
        System.out.println(checkPassword("ABCef342OSS"));
        System.out.println(checkPassword("ABC"));
        System.out.println(checkPassword("123"));
    }
}