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

public class Replaceall {

    public static void main(String args[]) {
        Pattern p = Pattern.compile("(k|K)ava");
        String text = "kavaSun's regex library Kava is now kava";
        System.out.println("Text before replacement is:"+text);
        Matcher matcher = p.matcher(text);
        String str = matcher.replaceAll("Java");
        System.out.println("Text after replacement is:"+str);
    }
}