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public String replaceAll(String regex, String replacement)

public class Test {
    public static void main(String args[]) {
        String Str = new String("www.google.com");
        System.out.print("Return value if match is successful: ");
        System.out.println(Str.replaceAll("(.*)google(.*)", "tutorialpro"));
        System.out.print("Return value if match is unsuccessful: ");
        System.out.println(Str.replaceAll("(.*)taobao(.*)", "tutorialpro"));
    }
}

Return value if match is successful: tutorialpro
Return value if match is unsuccessful: www.google.com