使用Java+regex，我希望找到字符串中的重复字符，并将该子字符串替换为找到的字符和找到的次数

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

public class Main {
    public static void main(String[] args) {
        String input = "abcaabbcc";
        Pattern pattern = Pattern.compile("(\\w)\\1+");
        Matcher matcher = pattern.matcher(input);
        
        StringBuffer output = new StringBuffer();
        while (matcher.find()) {
            String match = matcher.group();
            int count = match.length();
            matcher.appendReplacement(output, match.charAt(0) + String.valueOf(count));
        }
        matcher.appendTail(output);
        
        System.out.println(output.toString());
    }
}

abca2b2c2