Question

Write a program that takes as input an array of strings are prints only the words that start and end with capital letter. Words are only strings that consist of English alphabet letters. Use regex.

Examples:

Answer 1

Here is the solution my friend (note the regular expression):

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Pr_06_StartsAndEndsWithCapitalLetter {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();

        Pattern pattern = Pattern.compile("\\b([A-Z])+([a-zA-Z]+)?([A-Z])\\b");
        Matcher matcher = pattern.matcher(input);

        while (matcher.find()) {
            System.out.println(matcher.group());
        }
    }
}

Read here more: http://www.regular-expressions.info/wordboundaries.html and note that \b is a word boundary. It matches the beginning and ending of a word