java中匹配中文插入字符串

StringBuffer header = new StringBuffer("当前用户在哪里");   
  String name = (String) session.getAttribute("disName");//要插入的字符串
  Pattern p = Pattern.compile("[用][户]");
  Matcher matcher= p.matcher(header.toString());
  if (matcher.find()) {
   
   header.insert((matcher.start()+1), name);
  }
  System.out.println(header .toString());