Java

A password is validate if:

• It contains at least 8 characters and at most 15 characters.

• It contains at least one lower case alphabet.

• It contains at least one upper case alphabet.

• It contains at least one digit.

• It contains at least one special character i.e. !@#$%&*()-+=^.

• It does not contain space.

Code:

Import library:

import java.util.regex.Matcher;

import java.util.regex.Pattern;

Create a Password class

class Password
{
}

Create a regular expression to check a password is valid or not.

public static final Pattern PASSWORD_REGEX = Pattern.compile("^(?=.*[0-9])"
                       + "(?=.*[a-z])(?=.*[A-Z])"
                       + "(?=.*[@#$%^&+=])"
                       + "(?=\\S+$).{8,15}$");

Add a validatePassword method

public static String validatePassword(String str)
    {
       // System.out.println(str);
        Matcher matcher = PASSWORD_REGEX.matcher(str);
        return matcher.find()?"":" not";
    }

Main method

public static void main(String[] args)
    {
         String[] str = new String[]{"pollard@123A","Tesl@112","Park","Fest@4","TSHIRT","Ramesh123"};

         for(int i=0;i<str.length;i++)
         {
              System.out.println("The password "+str[i]+" is"+validatePassword(str[i])+" validate");
         }
    }

Output: