Search And Replace String in ByteBuffer

This is a simple java program which will search and replace a particular String in ByteBuffer

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
public class ByteBufferTest {
  
  public static void main(String[] args)
  {
    String fullText = "javarootsbestwebsiteoftheyear";
    String search = "website";
    String replace = "blog";
    ByteBuffer input = ByteBuffer.wrap(fullText.getBytes());
    byte[] toSearch = search.getBytes();
    int index = getIndex(input, toSearch);
    
    byte[] first = new byte[index];
    input.get(first);
    
    byte[] second = replace.getBytes();
    
    input.position(input.position()+search.length());
    
    ByteBuffer finalOne = ByteBuffer.allocate(first.length+second.length+input.remaining());
    finalOne.put(first);
    finalOne.put(second);
    finalOne.put(input);
    finalOne.flip();
    
    CharBuffer result = Charset.forName("UTF-8").decode(finalOne);
    String s = result.toString();
    System.out.println(s);
    
    
  }
  
  public static int getIndex(ByteBuffer input , byte[] toSearch)
  {
    int index = -1 ;
    while(input.hasRemaining() & index==-1)
    {
      boolean found = true ;
      for(byte b : toSearch)
      {
        if(input.get()!=b)
        {
          found = false ;
          break ; 
        }
      }
      if(found)
      {
        index= input.position()-toSearch.length;
      }
    }
    input.rewind();
    return index ;
  }
}

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