JAVA EE: How to count the number of times the word dog appears in the input string using Java Regex

Click here to watch on Youtube :
https://www.youtube.com/watch?v=aQPaJMInUEo&list=UUhwKlOVR041tngjerWxVccw

RegexDemo.java

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/**
 * 
 * This example that counts the number of times the word "dog" appears in the
 * input string
 *
 */

public class RegexDemo

{

    private static final String REGEX = "\\bdog\\b";

    private static final String INPUT = "dog dog dog dogiee dog";

    public static void main(String[] args)

    {

        Pattern p = Pattern.compile(REGEX);

        Matcher m = p.matcher(INPUT); // get a matcher object

        int count = 0;

        /*
         * Returns:true if, and only if, a subsequence of the input sequence
         * matches this matcher's pattern
         */

        while (m.find())

        {

            count++;

            System.out.println("Match number " + count);

            /*
             * Returns the start index of the previous match.
             */

            System.out.println("start(): " + m.start());

            /*
             * Returns the offset after the last character matched.
             */

            System.out.println("end(): " + m.end());

            System.out.println("---------------------");

        }

    }

}

Output

Match number 1

start(): 0

end(): 3

---------------------

Match number 2

start(): 4

end(): 7

---------------------

Match number 3

start(): 8

end(): 11

---------------------

Match number 4

start(): 19

end(): 22

---------------------