জাভা \B রেজেক্স

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

public class Main {
  public static void main(String[] args) {
  
    String text = "জাভাপাইথন";
    Pattern pattern = Pattern.compile("\Bপাইথন");

    Matcher matcher = pattern.matcher(text);

    while (matcher.find()) {
        System.out.println(matcher.group());
    }
  }
}