Validate Date with Regular Expression in ASP.NET

Here we have to discuss the Regular expression ie going to validate date on different way ie: different date format

Technologies:

ASP.NET

Language:

C# and VB.NET


Prerequisite

.NET Framework 2.0

Visual Studio 2005


Implementation Code

It depends on which is the format you want to use. For a date format like: yyyy-mm-dd you could write it like:

(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])

HTML CODE

hi, so what is the valid input? anyway, you can do something like this

{codecitation class="brush: csharp; gutter: true;" width="650px"}

"TextBox6" runat="server">
"RegularExpressionValidator2" runat="server" ControlToValidate="TextBox6"
            ErrorMessage="RegularExpressionValidator" ValidationExpression="(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])">
Invalid Date Format: (yyyy-mm-dd)

{/codecitation}

Here i am going to give different format of date expression you can change only the validationExpression

^((0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](?:19|20)\d\d)$ -- Invalid Date Format: (dd-mm-yyyy)

You can use dd MM yyyy HH:mm:ss with this expression:

(0[1-9]|[12][0-9]|3[01])\s(0[1-9]|1[012])\s(19|20)\d\d\s([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])

To use the moth in the MMM format you would have to provide each moth as an option in the expression. Here is one example for January, February and March

(0[1-9]|[12][0-9]|3[01])\s(jan|fev|mar|etc)\s(19|20)\d\d\s([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])

Thank you

Venkat