用于java的String.matches方法的正则表达式？

String str = "Hello World!";
String regex = "Hello.*World!";
if (str.matches(regex)) {
    System.out.println("Match found!");
} else {
    System.out.println("No match found!");
}

String str = "Hello World!";
String regex = "Hello.*World.*";
if (str.matches(regex)) {
    System.out.println("Match found!");
} else {
    System.out.println("No match found!");
}