不区分大小写进行替换

/**
 *不区分大小写进行替换
 */
public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		test_replaceAll();
	}
	
	public static void test_replaceAll(){
		String input = "Hello World!";
		String input2 = "HELLO WORLD!" ;
		String inputStr = "REPLAce";
		String replacement="china";

		System.out.println(input);
		System.out.println(input.replaceAll("(?i)world", replacement));
		System.out.println(input2.replaceAll("(?i)world", replacement));
		System.out.println(inputStr.replaceAll("(?i)replace", "Replace"));
	}
}