java 从字符串中提取日期

 String content = " �� t 2022-02-28 18:14:42";

    public String getDate(String content){

        Pattern p = Pattern.compile("(\\d{4})-(\\d{1,2})-(\\d{1,2}) (\\d{1,2}):(\\d{1,2}):(\\d{1,2})");
        Matcher matcher = p.matcher(content);
        while (matcher.find()) {
            return matcher.group(0);
        }
        return "";
    }