Java之用正则表达式提取数据

要将字符串如11月7日10点前反馈提取数据进行存储，可使用正则表达式。

代码示例如下：

String actualFeedbackTime = "11月7日10点前反馈";

Pattern ptn = Pattern.compile("(\\d+)月(\\d+)日(\\d+)点前反馈");
Matcher matcher = ptn.matcher(actualFeedbackTime);

LocalDateTime date = LocalDateTime.now();
if (matcher.matches()) {
    String month = matcher.group(1);
    String day = matcher.group(2);
    String hour = matcher.group(3);
    Calendar calendar = Calendar.getInstance();
    int year = calendar.get(Calendar.YEAR);
    date = LocalDateTime.of(year, Integer.parseInt(month), Integer.parseInt(day), Integer.parseInt(hour), 0, 0);
}