时间格式验证正则表达式,军事或 AM/PM 但不是两者

Time format validation regex, either military or AM/PM but not both

我这里有这个正则表达式:

^(\d{1,2}):(\d{2})(:00)?(\s)?(AM|PM|am|pm)?$

它做得很好。允许 23:00:0012:00 AM1:00am

问题是它也允许像 23:24 AM.

这样的东西

如果第一组数字大于 12,修改或附加此内容以禁止 AM/PM 的最佳方法是什么?

尝试一下:

^(?:(?:(?:0?\d|1[012]):[0-5]\d(?::00)? ?[ap]m)|(?:[01]?\d|2[0-3]):[0-5]\d(?::00)?)$

解释:

^
(?:                 : start non capturing group
  (?:               : start non capturing group
    (?:             : start non capturing group
      0?\d          : matches optional 0 followed by 1 digit
      |             : OR
      1[012]        : 1 followed by digit between 0 and 2
    )               : end group
    :               : literally :
    [0-5]\d         : digit between 0 and 5 followed by any digit
    (?::00)?        : optional 00 seconds
     ?              : optional space
    [ap]m           : am or pm
  )                 : end group 
  |                 : OR
  (?:               : start non capturing group
   [01]?\d          : 0 or 1 (optional) followed by any digit
   |                : OR
   2[0-3]           : 20 to 23
  )                 : end group
  :                 : literally :
  [0-5]\d           : digit between 0 and 5 followed by any digit
  (?::00)?          : optional 00 seconds
)                   : end group
$                   

这是我解决问题的尝试:

^((0?[0-9]|1[0-2]):([0-5][0-9])(?::([0-5][0-9]))?)\s?([ap]m)?|([0-1][0-9]|[2][0-3]):([0-5][0-9])(?::([0-5][0-9]))?$

JS:

var re = /^((0?[0-9]|1[0-2]):([0-5][0-9])(?::([0-5][0-9]))?)\s?([ap]m)?|([0-1][0-9]|[2][0-3]):([0-5][0-9])(?::([0-5][0-9]))?$/gmi; 

demo

注意使用 i 选项(启用不区分大小写的匹配)和 m 来匹配整行。

此正则表达式允许分钟和秒(秒是可选的)。