regex - android

//https://regexr.com/

package com.example.zeevm.myregex;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

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

public class MainActivity extends AppCompatActivity {

    private static final String TAG="REGEX";

    private final String REGEX="\\boleg.\\b";
    private final String INPUT="oleg oleg2 olegy olega aleg aoleg";
    private final String REPLEACE = "Bar ";
    private final String REGEX_OLEG="Oleg";
    private final String INPUT2="Oleg bought a new Volvo and Oleg bought a villa and a viola";
    private final String REPLEACE_TO_TRUTH="Anna";



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //regex1();
        //regex2();

        regex3();
    }

    private void regex1() //find
    {
        Pattern p = Pattern.compile(REGEX);
        Matcher m= p.matcher(INPUT);

        int counter=0;
        while (m.find())
        {
            counter+=1;
        }
        Log.e(TAG, "regex1: oleg was found "+counter+" times");
    }

    private void regex2() //replace
    {
        Pattern p = Pattern.compile(REGEX);
        Matcher m = p.matcher(INPUT);
        String input = m.replaceAll(REPLEACE);

        Log.e(TAG, "regex2: "+input );
    }

    private void regex3()
    {
        Pattern p = Pattern.compile(REGEX_OLEG);
        Matcher m = p.matcher(INPUT2);
        int counter=0;

        while (m.find())
        {
            counter+=1;
        }
        Log.e(TAG, "regex3: need to replace oleg "+counter+" Times");

        String theTruth=m.replaceAll(REPLEACE_TO_TRUTH);


        Log.e(TAG, "regex3: "+theTruth);
    }
}