寻找正则表达式来验证 MM/DD/YY HH:mm 格式答案

【问题标题】：Looking for Regex to validate MM/DD/YY HH:mm format寻找正则表达式来验证 MM/DD/YY HH:mm 格式
【发布时间】：2011-11-16 05:28:05
【问题描述】：

我正在寻找与 ASP.NET 正则表达式验证器控件一起使用的正则表达式，以检查以下格式：

08/10/11 23:00

它必须是MM/DD/YY HH:mm，使用 24 小时制。提前感谢您的帮助！

【问题讨论】：

用户设置有什么作用吗？

标签： asp.net regex validation

【解决方案1】：

这符合您的规范，尽管有点灵活。

/^(?:0?[1-9]|1[012])/(?:0?[1-9]|[12]\d|3[01])/(?:\d\d)\s+(?:[01]?\d|2[0-3]):(?:[0-5]\d)$/

我猜你可以根据自己的需要定制它。

说明：

    "
^              # Assert position at the beginning of the string
(?:            # Match the regular expression below
                  # Match either the regular expression below (attempting the next alternative only if this one fails)
      0              # Match the character “0” literally
         ?              # Between zero and one times, as many times as possible, giving back as needed (greedy)
      [1-9]          # Match a single character in the range between “1” and “9”
   |              # Or match regular expression number 2 below (the entire group fails if this one fails to match)
      1              # Match the character “1” literally
      [012]          # Match a single character present in the list “012”
)
/              # Match the character “/” literally
(?:            # Match the regular expression below
                  # Match either the regular expression below (attempting the next alternative only if this one fails)
      0              # Match the character “0” literally
         ?              # Between zero and one times, as many times as possible, giving back as needed (greedy)
      [1-9]          # Match a single character in the range between “1” and “9”
   |              # Or match regular expression number 2 below (attempting the next alternative only if this one fails)
      [12]           # Match a single character present in the list “12”
      \d             # Match a single digit 0..9
   |              # Or match regular expression number 3 below (the entire group fails if this one fails to match)
      3              # Match the character “3” literally
      [01]           # Match a single character present in the list “01”
)
/              # Match the character “/” literally
(?:            # Match the regular expression below
   \d             # Match a single digit 0..9
   \d             # Match a single digit 0..9
)
\s             # Match a single character that is a “whitespace character” (spaces, tabs, line breaks, etc.)
   +              # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
(?:            # Match the regular expression below
                  # Match either the regular expression below (attempting the next alternative only if this one fails)
      [01]           # Match a single character present in the list “01”
         ?              # Between zero and one times, as many times as possible, giving back as needed (greedy)
      \d             # Match a single digit 0..9
   |              # Or match regular expression number 2 below (the entire group fails if this one fails to match)
      2              # Match the character “2” literally
      [0-3]          # Match a single character in the range between “0” and “3”
)
:              # Match the character “:” literally
(?:            # Match the regular expression below
   [0-5]          # Match a single character in the range between “0” and “5”
   \d             # Match a single digit 0..9
)
$              # Assert position at the end of the string (or before the line break at the end of the string, if any)
"

【讨论】：

为什么您的括号分组以(?: 开头，而不仅仅是(？这两个额外的字符如何改变正则表达式逻辑？
@ean5533 因为我不想将它们用作反向引用，而是简单地使用交替并将正则表达式的各个部分分组。如果您删除 ?: 您将每个括号存储到一个反向引用组中，在这种情况下没有要求。逻辑保持不变。
有趣，不知道那个修饰符。谢谢。
-1：not 匹配月份 10 和 would 匹配月份 00，日期 00 - 有点太灵活了切合实际（尤其是不允许在 10 月约会）
@CodeJockey 我没想到你会做得更少。感谢您的评论。