how to replace string case insensitive in java

/**
 * @author lautturi.com 
 * Java example: replace substring of string case insensitive in java
 */

import java.util.*;

public class Lautturi {
	public static void main(String[] args) {
		String str = "welcom to Java world. jaVa is a high-level programming language.";
		
		str = str.replaceAll("(?i)java", "JAVA"); 
		System.out.println(str);
	}
}

output:

welcom to JAVA world. JAVA is a high-level programming language.