Java 正则 , 截取两个特殊字符之间字符串

String formula = "【1】【2】【3】";

String regex = "【([^】]*)】";

Pattern pattern = Pattern. compile(regex);

Matcher matchar = pattern.matcher(formula);

while (matchar.find()) {

      System.out.println(matchar.group(1));

 }

 String content = "good[hello]123";

 String regex="(?<=\\[)(\\S+)(?=\\])"; //匹配方括号

 //String regex = "(?<=\\()[^\\)]+";   //匹配圆括号

 Pattern p = Pattern.compile(regex);

 Matcher matcher = p.matcher(content);

 while (matcher.find()) {

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

}