почему?
package com.javarush.task.task19.task1907;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/*
Считаем слово
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
BufferedReader fr = new BufferedReader(new FileReader(reader.readLine()));
reader.close();
String text = "";
int count = 0;
while (fr.ready()){
text = text + fr.readLine();
}
fr.close();
text.toLowerCase();
text = text.replaceAll("\\p{P}", " ");
Pattern p = Pattern.compile("\\b\\sworld\\s\\b", Pattern.UNICODE_CASE|Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(text);
while (m.find()) count++;
System.out.println(count);
}
}