如何使用Java Pattern和Matcher在字符串中查找2次字符串？

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringSearch {
    public static void main(String[] args) {
        String input = "This is a test string. Test is the keyword.";
        String keyword = "test";

        Pattern pattern = Pattern.compile(keyword, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(input);

        int count = 0;
        while (matcher.find()) {
            count++;
            if (count == 2) {
                int start = matcher.start();
                int end = matcher.end();
                System.out.println("第2次出现的位置：从" + start + "到" + end);
                break;
            }
        }
    }
}

第2次出现的位置：从23到27