Passay - LengthComplexityRule

LengthComplexityRule helps in defining the applicable rule on a password based on its length. Consider the following policy.

• If length of password is in between 1 to 5 characters, only lower case alphabets are allowed.

• If length of password is in between 6 to 8 characters, then only a, b and c are allowed.

Example - Validating Password as per Length Complexity Rule

The below example shows validation of an invalid password as per Length Complexity Rule.

PassayDemo.java

package com.tutorialspoint;

import org.passay.AllowedCharacterRule;
import org.passay.CharacterRule;
import org.passay.EnglishCharacterData;
import org.passay.LengthComplexityRule;
import org.passay.PasswordData;
import org.passay.PasswordValidator;
import org.passay.RuleResult;

public class PassayDemo {
   public static void main(String[] args) {
      LengthComplexityRule lengthComplexityRule = new LengthComplexityRule();
      //Rule: Password of 1 to 5 characters should contains lower case alphabets only
      lengthComplexityRule.addRules("[1,5]", 
         new CharacterRule(EnglishCharacterData.LowerCase, 5));
      //8 and 16 characters
      lengthComplexityRule.addRules("[6,8]", 
         new AllowedCharacterRule(new char[] { 'a', 'b', 'c' }));    
      PasswordValidator validator = new PasswordValidator(lengthComplexityRule);
      PasswordData password = new PasswordData("abcdef");
      RuleResult result = validator.validate(password);
      if(result.isValid()){
         System.out.println("Password validated.");
      }else{
         System.out.println("Invalid Password: " + validator.getMessages(result));            
      }
   }
}

Output

Compile and run the code to verify the result −

Invalid Password: [Password contains the illegal character 'd'., Password contains the illegal character 'e'., Password contains the illegal character 'f'., Password meets 0 complexity rules, but 1 are required.]

Example - Validating a Valid Password as per Length Complexity Rule.

The below example shows validation of a valid password as per Length Complexity Rule.

PassayDemo.java

package com.tutorialspoint;

import org.passay.AllowedCharacterRule;
import org.passay.CharacterRule;
import org.passay.EnglishCharacterData;
import org.passay.LengthComplexityRule;
import org.passay.PasswordData;
import org.passay.PasswordValidator;
import org.passay.RuleResult;

public class PassayDemo {
   public static void main(String[] args) {
      LengthComplexityRule lengthComplexityRule = new LengthComplexityRule();
      //Rule: Password of 1 to 5 characters should contains lower case alphabets only
      lengthComplexityRule.addRules("[1,5]", 
         new CharacterRule(EnglishCharacterData.LowerCase, 5));
      //8 and 16 characters
      lengthComplexityRule.addRules("[6,8]", 
         new AllowedCharacterRule(new char[] { 'a', 'b', 'c' }));    
      PasswordValidator validator = new PasswordValidator(lengthComplexityRule);
      PasswordData password = new PasswordData("abcde");
      RuleResult result = validator.validate(password);
      if(result.isValid()){
         System.out.println("Password validated.");
      }else{
         System.out.println("Invalid Password: " + validator.getMessages(result));            
      }
   }
}

Output

Compile and run the code to verify the result −

Password validated.