密码验证正则表达式android

Question

我需要进行以下密码验证：

1. 最少 8 个字符，最多 15 个字符
2. 至少一个数字和 1 个来自 (!@#$%^&*-=+?.) 的特殊字符；
3. 至少一个小写字母
4. 密码不应是用户名和电子邮件的子字符串（最小长度为 3，最大长度为 15）。
5. 密码应区分大小写。

我也看过这些answers，但我很困惑，我应该使用输入过滤器还是正则表达式？

任何帮助都将不胜感激。如果你能提供一个可行的解决方案，那就太好了。

Answer 1

public class Validation {

    public static void main(String[] args) {  
       String pass = "1AB%CDef555";
       String username = "manna";
       String email = "mannx@rtt.com";
       System.out.println(validiate2(pass, username,email));
    }
    // if you don't care why it fails and only want to know if valid or not 
    public static boolean validiate (String pass, String username, String email){
        String pattern = "^(?=.*[0-9])(?=.*[a-z])(?=.*[!@#$%^&*+=?-]).{8,15}$";
        if(pass.matches(pattern)){
            for(int i=0;(i+3)<username.length();i++){
                if(pass.contains(username.substring(i,i+3)) || username.length()<3 || username.length()>15){
                   return false; 
                }                  
            }
            for(int i=0;(i+3)<email.length();i++){
                if(pass.contains(email.substring(i,i+3)) || email.length()<3 || email.length()>15){
                   return false; 
                }                  
            }
            return true;
        }
        return false;    
    }
    // if you want to know which requirement was not met
    public static boolean validiate2 (String pass, String username, String email){
        if (pass.length() < 8 || pass.length() >15 ){
            System.out.println("pass too short or too long");
            return false;
        }
        if (username.length() < 3 || username.length() >15 ){
            System.out.println("username too short or too long");
            return false;
        }
        if (!pass.matches(".*\\d.*")){
            System.out.println("no digits found");
            return false;
        } 

        if (!pass.matches(".*[a-z].*")) {
            System.out.println("no lowercase letters found");
            return false; 
        }
        if (!pass.matches(".*[!@#$%^&*+=?-].*")) {
            System.out.println("no special chars found");
            return false; 
        } 
        if (containsPartOf(pass,username)) {
            System.out.println("pass contains substring of username");
            return false; 
        }
        if (containsPartOf(pass,email)) {
            System.out.println("pass contains substring of email");
            return false; 
        }
        return true;           
    }

    private static boolean containsPartOf(String pass, String username) {
        int requiredMin = 3
        for(int i=0;(i+requiredMin)<username.length();i++){
            if(pass.contains(username.substring(i,i+requiredMin))){
               return true; 
            }                  
        }
        return false;        
    }    
}

Answer 2

有great library。
它使用字段注释并具有丰富的定制化。 我认为#4 仍然需要手工完成，但你应该明确地检查图书馆。

这是来自 github 的示例：

@Password(min = 6, scheme = Password.Scheme.ALPHA_NUMERIC_MIXED_CASE_SYMBOLS)
private EditText passwordEditText;

干杯。

Answer 3

你可以试试这个：

^(?!.*(user|emailaddress))(?=.*\d)(?=.*[! @#$%^&*=+?.-])(?=.*[a-z]).{8,15}$

确保用变量替换用户和电子邮件地址

Explanation

这段代码对我来说很好用：

public class NewClass1 {
    public static void main(String[] args) {
        NewClass1 nc = new NewClass1();
        nc.check("abcd123-", "userName", "abc@yahoo.com");
        nc.check("userName1-", "userName", "abc@y.c");
        nc.check("abc@y.c1b", "userName", "abc@y.c");
        nc.check("abcy.c1b", "userName", "abc@y.c");
        nc.check("abcd123-", "userName", "abc@yahoo.com");
    }

    public void check(String string, String userName, String email) {

        final String regex = "^(?!.*(" + userName + "|" + email + "))(?=.*\\d)(?=.*[! @#$%^&*=+?.-])(?=.*[a-z]).{8,15}$";
        final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
        final Matcher matcher = pattern.matcher(string);
        if (matcher.find()) {
            System.out.println(string + "Full match: " + matcher.group(0));
        } else {
            System.out.println("no match");
        }
    }
}