正则表达式以匹配mm/dd/yyyy hh:mm:ss AM或PM [英] Regex to match mm/dd/yyyy hh:mm:ss AM or PM

问题描述

我有一个为时间戳创建信息的程序，该时间戳必须匹配以下格式:MM/DD/YYYY HH:MM:SS AM or PM

I have a program that creates information for a time stamp, the time stamp has to match the following format: MM/DD/YYYY HH:MM:SS AM or PM

例如:

06/02/2016 10:14:56 AM

09/14/2014 9:16:32 PM

我需要一种使用更好的正则表达式来匹配此信息的方法，但是它不一定是正则表达式.任何帮助，将不胜感激.

I need a way to match this information using preferable a regex, however it doesn't have to be a regex. Any help with this would be greatly appreciated.

我知道如何匹配数字/\d+/和非空格字符，但是匹配数字不会抓住:，/，AM or PM.抓住非空白区域将获得除明显的空白区域以外的所有内容.

I know how to match the digits /\d+/, and non white space characters, however matching the digits won't grab the :, /, AM or PM. And grabbing the non white space will grab everything except for the obviously white space.

因此，回顾一下，我需要一种方法来验证格式化的时间和日期:MM/DD/YYYY HH:MM:SS AM or PM可以包含20到22个字符(包括空格)或是否作为用户输入给出.

So to recap I need a way to verify that a formatted time and date: MM/DD/YYYY HH:MM:SS AM or PM That can contain 20 to 22 characters (including white space) exists or not given as user input.

我需要的示例:

def timestamp
  print 'Enter the time stamp to verify: '
  ts = gets.chomp
  if !(ts[REGEX-HERE])
    puts 'Invalid formatting of time stamp'
    exit 1
  else
    puts ts
  end
end

# <= 6/1/2016 1:10:5 PM will output '6/1/2016 1:10:5 PM'
# <= 06/01/2016 01:10:05 PM will output 'Invalid formatting of time stamp'
# <= 10/1/2016 1:25:43 AM will output '10/1/2016 1:25:43 AM'
# <= 10/01/2016 01:25:43 AM will output 'Invalid formatting of time stamp'

推荐答案

此正则表达式可为您验证输入内容:

This regex should work for you for validation of your inputs:

^\d{1,2}\/\d{1,2}\/\d{4} \d{1,2}:\d{1,2}:\d{1,2} [AP]M\z

RegEx演示

这将验证以下任一输入行:

This will validate either of these inputs lines:

10/22/2016 9:15:32 PM
9/9/2016 9:9:5 AM

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