Code

package com.test.controller;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Scanner;

import java.util.regex.*;

class baser {

static String fileName = "D:\\Test\\TestProject\\src\\com\\test\\controller\\file.txt";

public static void main(String[] args) {

Scanner sc = null;

try {

sc = new Scanner(new File(fileName));

} catch (FileNotFoundException e) {

e.printStackTrace();

}

sc.useDelimiter("\n");

Path path = Paths.get(fileName);

int linescount = 0;

try {

linescount = (int) Files.lines(path).count();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println("linescount:::" + linescount);

String[] lines = new String[linescount];

int i = 0;

while (sc.hasNext()) {

String s = sc.next();

if (s.trim().isEmpty()) {

continue;

} else {

lines[i] = s;

i++;

}

}

int startpoint = 0;

int endingpoint = 0;

for (int j = 0; j < lines.length; j++) {

if (lines[j] != null) {

boolean s1 = lines[j].contains("REPLACE==ZZZZ");

boolean s2 = lines[j].contains("REPLACE OFF");

if (s1) {

startpoint = j;

}

if (s2) {

endingpoint = j;

}

}

}

System.out.println("Starting Point:::" + startpoint);

System.out.println("Ending Point:::" + endingpoint + "\n");

for (int j = 0; j < lines.length; j++) {

if (lines[j] != null) {

String ip = lines[j];

String sb = ip;

if (j >= startpoint && j <= endingpoint) {

Pattern p = Pattern.compile("ZZZZ", Pattern.MULTILINE);

if (p.matcher(ip).find() == true) {

Matcher m = p.matcher(ip);

sb = m.replaceAll("WORK");

}

}

System.out.println(sb);

}

}

}

}