Code Recipes Blog

In this post under Passay, I will explain with example the purpose of “RepeatCharacterRegexRule” rule.

This rule checks the user inputed password for repeated ASCII characters. If a particular ASCII character is repeated more than the preconfigured character count, the rule will invalidate the password.

Let’s say, the pre-configured character count is 3, and below are the password we are validating

• a_bbb_cc
• a_bb_cc
• a_bbbb_cc

The password “a_bb_cc” will pass the validation whereas the other two will fail because the character ‘b’ is repeated more than 3 times.

Below is the main class showing how to use the “RepeatCharacterRegexRule” class

Main class

package defaultPackage;

import org.passay.PasswordData;
import org.passay.PasswordValidator;
import org.passay.RepeatCharacterRegexRule;
import org.passay.RuleResult;

public class Example26 {
    public static void main(String[] args) {
        RepeatCharacterRegexRule repeatCharacterRegexRule = new RepeatCharacterRegexRule();
        PasswordValidator passwordValidator = new PasswordValidator(repeatCharacterRegexRule);

        PasswordData passwordData = new PasswordData("aa_bbb_ccdefgh");
        RuleResult ruleResult = passwordValidator.validate(passwordData);
        System.out.println("is aa_bbb_ccdefgh valid: " + ruleResult.isValid());

        passwordData = new PasswordData("aa_bbbbb_ccdefgh");
        ruleResult = passwordValidator.validate(passwordData);
        System.out.println("is aa_bbbbb_ccdefgh valid: " + ruleResult.isValid());

        passwordData = new PasswordData("aa_bb_ccdefgh");
        ruleResult = passwordValidator.validate(passwordData);
        System.out.println("is aa_bb_ccdefgh valid: " + ruleResult.isValid());
    }
}

In the above code, at line 10, I create an instance of “RepeatCharacterRegexRule” using no-argument constructor. As a result the default character count of 5 will be used.

At line 11, I create an instance of “PasswordValidator” using the newly created instance of “RepeatCharacterRegexRule” as an argument.

At line 14, I validate the password “aa_bbb_ccdefgh” and the result is printed at line 15.

At line 18, I validate the password “aa_bbbbb_ccdefgh” and the result is printed at line 19

At line 22, I validate the password “aa_bb_ccdefgh” and the result is printed at line 23

In this way, we can use “RepeatCharacterRegexRule”

Below is the output

Output

is aa_bbb_ccdefgh valid: true
is aa_bbbbb_ccdefgh valid: false
is aa_bb_ccdefgh valid: true