Validate textBox

Question

User-797751191 posted

Hi

  I have Textbox in which user can multiple Dates . I want to check that User enters valid Data

Data should be 02-06-2019 , 04-07-2019 , 01-06-2019 

Thanks

Answer 1

User288213138 posted

Hi jsshivalik,

You can use RegularExpressionValidator control to validates whether the value of an associated input control matches the pattern specified by a regular expression.

Here is the Regular expression that matches all valid dates including leap years. Formats accepted mm/dd/yyyy or mm-dd-yyyy or mm.dd.yyyy format.

The code:

 <asp:TextBox ID="txtRemarks" runat="server">
        </asp:TextBox>
        <asp:RegularExpressionValidator ControlToValidate="txtRemarks" ID="rfv0"
            ValidationExpression="^(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]))\1|(?:(?:29|30)(\/|-|\.)(?:0?[1,3-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$|^(?:29(\/|-|\.)0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9])|(?:1[0-2]))\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$"
            runat="server" ErrorMessage="please input Correct dates">
        </asp:RegularExpressionValidator>

The result:

Best regards,

Sam

Answer 2

User-797751191 posted

Hi Samwu

  Can u pls explain the code

Thanks

Answer 3

User288213138 posted

Hi jsshivalik,

RegularExpressionValidator is a and validation controls.I said above validates whether the value of an associated input control matches the pattern specified by a regular expression.

ValidationExpression is gets or sets the regular expression that determines the pattern used to validate a field.

ControlToValidate is gets or sets the input control to validate.

ErrorMessage is gets or sets the text for the error message displayed in a ValidationSummary control when validation fails.

Best regards,

Sam