如何获得日期的有效正则表达式 [英] How do I get a valid regularexpression for a date
问题描述
我在VS 2015中使用MVC 5.2应用程序，使用SQL Server 2016.
我有一个名为Assessment_Date的字段，在数据库中定义为varchar（10），不是日期，因为我只想处理日期而不是时间。
我想要求用户输入日期形式：mm / dd / yyyy
在我的部分课程中，我有以下与该领域相关的内容：
[RegularExpression（@/ ^ \\\ {2} \ / \\\ {2} \ / \d {4} $ /）]
public string Assessment_Date {get;组; }
并在编辑视图中，我有以下验证消息行：
@ Html.ValidationMessageFor（model => model.Assessment_Date，mm / dd / yyyy，new {@class =text-danger}）
结果是它输入了我输入框中的所有内容，即使它是一个格式正确的日期，如01/02/2017。
我在在线正则表达式测试和调试器：PHP，PCRE，Python，Golang和JavaScript 上检查了RegularExpression [ ^ ]和RegularExpression允许正确格式化的日期，如上所述。
这个RegularExpression在MVC中失败的原因是什么？我在包含RegularExpression的引号之前放置了@符号;否则，它会抱怨无法识别的转义码。我也曾经使用RegularExpressions遇到过麻烦。是否有一些技巧让他们使用MVC？谢谢。
我尝试过：
RegularExpression格式化日期字符串为mm / dd / yyyy
见上文。
I have an MVC 5.2 app in VS 2015, working with SQL Server 2016.
I have a field called Assessment_Date, which is defined in the database as a varchar(10), not as a Date, as I only want to work with the date and not the time.
I want to require the users to enter a date in the form: mm/dd/yyyy
In my partial class, I have the following lines pertinent to this field:
[RegularExpression(@"/^\d{2}\/\d{2}\/\d{4}$/")]
public string Assessment_Date { get; set; }
and in the Edit view, I have the following validation message line:
@Html.ValidationMessageFor(model => model.Assessment_Date, "mm/dd/yyyy", new { @class = "text-danger" })
The result is that it fails everything I type into the box, even if it's a correctly formatted date, like 01/02/2017.
I checked the RegularExpression on Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript[^] and the RegularExpression is allowing correctly-formatted dates like the one above.
What might be the reason why this RegularExpression is failing in MVC? I placed the @ sign before the quotes containing the RegularExpression; otherwise, it complains about unrecognized escape codes. I've had trouble in the past with RegularExpressions too. Is there some trick to getting them to work with MVC? Thanks.
What I have tried:
RegularExpression to format date string to mm/dd/yyyy
See above.
推荐答案
/）]
公共字符串Assessment_Date {get; set;}
并在编辑视图中，我有以下验证消息行：
@ Html.ValidationMessageFor（model => model.Assessment_Date，mm / dd / yyyy，new {@class =text-danger}）
结果是它输入了我输入框中的所有内容，即使它是一个格式正确的日期，如01/02/2017。
我在在线正则表达式测试和调试器：PHP，PCRE，Python，Golang和JavaScript 上检查了RegularExpression [ ^ ]并且RegularExpression允许正确格式化的日期，如上图所示。
什么mi这就是为什么这个RegularExpression在MVC中失败的原因？我在包含RegularExpression的引号之前放置了@符号;否则，它会抱怨无法识别的转义码。我也曾经使用RegularExpressions遇到过麻烦。是否有一些技巧让他们使用MVC？谢谢。
我尝试过：
RegularExpression格式化日期字符串为mm / dd / yyyy
见上文。
/")]
public string Assessment_Date { get; set; }
and in the Edit view, I have the following validation message line:
@Html.ValidationMessageFor(model => model.Assessment_Date, "mm/dd/yyyy", new { @class = "text-danger" })
The result is that it fails everything I type into the box, even if it's a correctly formatted date, like 01/02/2017.
I checked the RegularExpression on Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript[^] and the RegularExpression is allowing correctly-formatted dates like the one above.
What might be the reason why this RegularExpression is failing in MVC? I placed the @ sign before the quotes containing the RegularExpression; otherwise, it complains about unrecognized escape codes. I've had trouble in the past with RegularExpressions too. Is there some trick to getting them to work with MVC? Thanks.
What I have tried:
RegularExpression to format date string to mm/dd/yyyy
See above.
尝试：
Try:
[RegularExpression(@"^\d{2}/\d{2}/\d{4}
）]
以下是RegEx文档的链接：
perlre - perldoc。 perl.org [ ^ ]
以下是帮助构建RegEx并调试它们的工具的链接：
.NET Regex Tester - Regex Storm [ ^ ]
快速正则表达式工具 [ ^ ]
这个显示哟RegEx是一个很好的图表，它非常有助于理解RegEx的作用：
Debuggex：在线可视正则表达式测试器。 JavaScript，Python和PCRE。 [ ^ ]
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]
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