Android - Regex for password must contain a minimum of 8 in length including characters(Upper or Lower), at least one number?

Question

I have seen this question related to javascript but it didn't work for me in android. I want to validate my password which must contain a minimum of 8 in length including characters(Upper or Lower), at least one number? (It should not contain any special symbols)

I have tried this it is working fine with only lower case but not taking Upper case letters.

private boolean isPasswordContainsNumericAndChars(String password) {
        /*^               # start-of-string
        (?=.*\d)          # a digit must occur at least once
        (?=.*[a-z])       # a lower case letter must occur at least once
        (?=.*[A-Z])       # an upper case letter must occur at least once
        (?=.*[@#$%^&+=])  # a special character must occur at least once you can replace with your special characters
        (?=\\S+$)         # no whitespace allowed in the entire string
        .{8,}             # anything, at least eight places though
        $                 # end-of-string*/
        final String PASSWORD_PATTERN = "(?=.*\\d)(?=.*[a-z]).{8,}";
        Pattern pattern = Pattern.compile(PASSWORD_PATTERN);
        Matcher matcher = pattern.matcher(password);
        return matcher.matches();
    }

As he mentioned in the duplicate question which is not working in android.

Minimum eight characters, at least one letter and one number:

 "^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$"

I have updated my question, please check it once @WiktorStribiżew — Shailendra Madda, Feb 19 '21 at 11:56
But you did not actually use the regex you said you found. Use it. `PASSWORD_PATTERN = "(?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{8,}"` — Wiktor Stribiżew, Feb 19 '21 at 11:57
@WiktorStribiżew If I use the regex which you mentioned above, I must need to enter upper case letter also which is not my matching to the given requirement. — Shailendra Madda, Feb 19 '21 at 12:01
If you do not require an uppercase letter, remove that `(?=.*[A-Z])` lookahead, what is the problem? — Wiktor Stribiżew, Feb 19 '21 at 12:02
Either it should take Lower with numeric or Upper with numeric — Shailendra Madda, Feb 19 '21 at 12:02
Then join the letter requiring lookaheads, `(?=.*[a-z])(?=.*[A-Z])` => `(?=.*[a-zA-Z])` — Wiktor Stribiżew, Feb 19 '21 at 12:02
Yeah great. Finally `final String PASSWORD_PATTERN = "(?=.*\\d)(?=.*[a-zA-Z]).{8,}";` this one is working. Thanks. — Shailendra Madda, Feb 19 '21 at 12:04
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/228947/discussion-between-shailendra-madda-and-wiktor-stribizew). — Shailendra Madda, Feb 19 '21 at 12:09

score 3 · Accepted Answer · answered Feb 22 '21 at 05:49

Finally this "(?=.*\\d)(?=.*[a-zA-Z]).{8,}" regex worked.

public static boolean isPasswordContainsNumericAndCharsWithMin8InLength(String password) {
        /*^               # start-of-string
        (?=.*\d)          # a digit must occur at least once
        (?=.*[a-z])       # a lower case letter must occur at least once
        (?=.*[A-Z])       # an upper case letter must occur at least once
        (?=.*[@#$%^&+=])  # a special character must occur at least once you can replace with your special characters
        (?=\\S+$)         # no whitespace allowed in the entire string
        .{8,}             # anything, at least eight places though
        $                 # end-of-string*/
        final String PASSWORD_PATTERN = "(?=.*\\d)(?=.*[a-zA-Z]).{8,}";
        Pattern pattern = Pattern.compile(PASSWORD_PATTERN);
        Matcher matcher = pattern.matcher(password);
        return matcher.matches();
    }

Android - Regex for password must contain a minimum of 8 in length including characters(Upper or Lower), at least one number?

1 Answers1