正则表达式 |闰年及更多 [英] Regular Expression | Leap Years and More

问题描述

我最近一直在寻找一种正则表达式来进行一些客户端日期检查，但一直找不到满足以下条件的正则表达式:

I've recently been looking for a regular expression to do some client side date checking, and I haven't been able to find one that can satisfy the following criteria:

• 范围从 1800 到现在
• 使用闰年执行正确的日期检查
• MM/DD/YYYY 表单
• 无效的日期检查

(这些限制超出了我的范围，是客户的要求，尽管我努力说服他们这不是最佳途径)

当前代码:

$('input').keyup(function()
{
       var regex = /^(?:(0[1-9]|1[012])[/.](0[1-9]|[12][0-9]|3[01])[/.](18|19|20)[0-9]{2})$/;
       $(this).toggleClass('invalid',!regex.test($(this).val()));    
});

更新:

我应该注意，这主要是为了看看这样的正则表达式是否可行(因为在这件事上我不选择使用正则表达式).我知道用于验证日期的其他(和更好)选项，但是如前所述 - 这是为了查看是否可以通过正则表达式.

I should note that this is primarily to see if a regular expression like this would be possible (as the use of a Regex is not my choice in this matter). I am aware of the other (and better) options for validating a date, however as previously mentioned - this is to see if it was possible through a regular expression.

推荐答案

正如在别处提到的，正则表达式几乎肯定不是你想要的.但是，话虽如此，如果你真的想要一个正则表达式，它是如何构建的:

As is mentioned elsewhere, regular expressions almost certanily not what you want. But, having said that, if you really want a regular expression, here is how it is built:

每月 31 天

(0[13578]|1[02])[/.](0[1-9]|[12][0-9]|3[01])[/.](18|19|20)[0-9]{2}

30 天月

(0[469]|11)[/.](0[1-9]|[12][0-9]|30)[/.](18|19|20)[0-9]{2}

2 月 1-28 日始终有效

February 1-28 always valid

(02)[/.](0[1-9]|1[0-9]|2[0-8])[/.](18|19|20)[0-9]{2}

2 月 29 日也适用于闰年

February 29 also valid on leap years

(02)[/.]29[/.](((18|19|20)(04|08|[2468][048]|[13579][26]))|2000)

这意味着如果你把它们放在一起就是这个:

which means it would be this if you put it all together:

((0[13578]|1[02])[/.](0[1-9]|[12][0-9]|3[01])[/.](18|19|20)[0-9]{2})|((0[469]|11)[/.](0[1-9]|[12][0-9]|30)[/.](18|19|20)[0-9]{2})|((02)[/.](0[1-9]|1[0-9]|2[0-8])[/.](18|19|20)[0-9]{2})|((02)[/.]29[/.](((18|19|20)(04|08|[2468][048]|[13579][26]))|2000))

这个版本有点短，但有点难理解.

This version is a little shorter, but a little harder to understand.

((0[13578]|1[02])[/.]31[/.](18|19|20)[0-9]{2})|((01|0[3-9]|1[1-2])[/.](29|30)[/.](18|19|20)[0-9]{2})|((0[1-9]|1[0-2])[/.](0[1-9]|1[0-9]|2[0-8])[/.](18|19|20)[0-9]{2})|((02)[/.]29[/.](((18|19|20)(04|08|[2468][048]|[13579][26]))|2000))

这些脚本很长而且无法维护.应该清楚，这不是一个好主意，但它是可能的.

These scripts are long and unmaintainable. It should be clear that this isn't a good idea, but it is possible.

注意事项:

• 范围 1800-2099(可以添加更多，没有太多困难，但需要在 4-6 个不同的地方进行更改)
• 需要 2 位数的月和日(可以从表达式中删除 ~8 处的严格性)
• [/.] 作为分隔符(8 个位置)
• 尚未经过测试(我们可以针对所有数字组合进行检查并与 javascript 日期函数进行比较?[证明我们正在重新发明轮子])

• range 1800-2099 (more can be added without too much difficulty, but requires changes in 4-6 disparate places)
• requires 2 digit months and days (the strictness could be removed from the expression in ~8 places)
• [/.] as seperators (8 places)
• Hasn't been tested (we could check it against all digit combinations and compare with the javascript date function? [proof that we're reinventing the wheel])

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