用于验证字符串中日期的正则表达式 [英] Regular expression to validate date within a string

问题描述

大家好，


如何验证字符串中的日期.我需要服务器端验证.我想使用正则表达式来验证字符串或语句中的日期...请为该问题建议服务器端代码.

例如:"DOB:02-02-1987"或"DOB:1987年5月14日"



谢谢

Hi All,


How to validate the date within a string..?? I want the server-side validation.I want the regular expression to validate date within a string or statement...please suggest server side code for this question.

For ex:"DOB:02-02-1987" or "DOB:14th may 1987"



Thanks

推荐答案

请参阅我的问题.我希望您可以决定不使用"14th"之类的非标准内容.

您实际上并不需要使用正则表达式.将字符串解析为日期或时间结构将是一种更可靠的方法.成功的话是有效的；如果解析失败，则不是.很简单.

在客户端，它将是这样的JavaScript:

Please see my question. I hope you can decide to work without non-standard things like "14th".

You don''t really need to use Regular Expressions. It will be way more reliable method to parse string as a date or time structure. In case of success, it''s valid; if parsing fails, it is not. Very simple.

On client side, it will be JavaScript like this:

function IsValidDate(dateString) {
    return !isNaN(Date.parse(dateString));
}

在服务器端，您需要使用System.DateTime方法Parse或ParseExact做同样的事情.与JavaScript不同，您需要以与所需区域性信息(IFormatProvider)和/或格式说明符相对应的准确格式提供输入字符串.但是对于Parse方法，有一些变体:仅日期，仅时间，两者，并且区域性应与当前线程区域性相对应.

此外，您需要在try-catch块中调用此类方法，因为它可以捕获异常.例如:

On server side, you need to do the same thing using System.DateTime methods Parse or ParseExact. Unlike JavaScript, you will need to supply input string in exact format corresponding to required culture information (IFormatProvider) and/or format specifiers; but for Parse method, there are variants: date only, time only, both, and the culture should correspond current thread culture.

Besides, you need to call such method in the try-catch block as it can catch exception. For example:

static bool IsValidDate(string value) {
   try {
        System.DateTime.Parse(value);
        return true;
   } catch(System.FormatException) {
        return false;
   } //exception
} //IsValidDate

请参阅:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx [ ^ ].

有关时间字符串格式，请参见:
http://msdn.microsoft.com/en-us/library/az4se3k1.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx [ ^ ].

—SA

Please see:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^].

For time string formats, please see:
http://msdn.microsoft.com/en-us/library/az4se3k1.aspx[^],
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx[^].

—SA

客户端日期日期类型的日期验证:"02-02-1987"

在客户端使用文本字段日期，双精度类型(全球化中的小数位或不同的十进制字符等)和货币验证时，我们经常使用正则表达式验证器并尝试编写复杂的正则表达式.验证这些数据类型的最简单方法是使用比较验证器.我认为这是用于验证数据类型的最强大，最强大的控件.您要做的就是设置

运算符="DataTypeCheck"
还有

类型=<<<您在这里需要的类型>>>"
它支持以下类型:

日期
货币
Double
整数
字符串
看下面的例子:

这将根据应用程序的当前区域性来验证日期.

Client Side Date Validation for Date Format of type: "02-02-1987"

When using text field date, Double type (decimal places or different decimal characters in globalization etc) and currency validation on client-side we often use regular expression validator and try to write complex regular expressions. The easiest way to validate these data types is to use compare validator. I think it’s the most powerful and awesome control for validating data types. All you have to do is to set

Operator="DataTypeCheck"
And

Type="<<your required type here >>>"
It supports following types:

Date
Currency
Double
Integer
String
Look at the following examples:

This validates the date according to current culture of the application.

<asp:textbox id=""txtDateStart"" cssclass=""input"" runat=""server"" width=""200″" xmlns:asp="#unknown">

<asp:comparevalidator id=""cmprValidatorDateStart"" controltovalidate=""txtDateStart"" xmlns:asp="#unknown">
    Type="Date" Display="Dynamic" Operator="DataTypeCheck" 
    ErrorMessage="*Not a valid date." runat="server"<>/asp:CompareValidator>

在后面的代码中使用DateTime.TryParseExact函数.

In code behind use the DateTime.TryParseExact function.

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