java正则匹配字符串最外层{}里的内容,包含{}

String s = "start {sffff''{adfaw3ea}wfewrfwef----}";

String regex = "(?<=\\{).*(?=\\})";

Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(s);
while (matcher.find()) {

System.out.println(matcher.group(0));

}

输出:{sffff''{adfaw3ea}wfewrfwef----}