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 ()) ;

}