Online Java replaceFirst() function

public class Main { public static void main(String[] args) { String Str = new String("Welcome to example.com"); System.out.println(); System.out.print("Return Value :" ); System.out.println(Str.replaceFirst("(.*)example(.*)", "java")); System.out.print("Return Value :" ); System.out.println(Str.replaceFirst("example", "java")); System.out.println(); } }