import java.util.*;
import java.lang.*;

import java.util.regex.*;

class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		StringBuilder sb = new StringBuilder();
        sb.append("This works with StringBuffers");
        Pattern p = Pattern.compile("\\Buffer\\B");
        Matcher m = p.matcher(sb);
        System.out.println(m.replaceAll("uilder"));
	}
}