CountSpecifiedWord.java

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

public class CountSpecifiedWord {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Insert text (haystack) = ");
        String hayStack = scanner.nextLine().toLowerCase();
        System.out.print("Insert needle string = ");
        String needle = scanner.next().toLowerCase();

        int counter = 0;
        String[] words = hayStack.split("[^a-z]");
        for (String word : words) {
            if (word.equals(needle)) {
                counter++;
            }
        }
        
        System.out.println(counter);
    }
}