Validate custom string using ASP.Net Regular Expressions

georgeac...

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User: georgeacuster8937
Posted: on Apr 06, 2022 07:51 AM
Forum: Regular Expressions with ASP.Net
Answer: 1
Views: 1741

Hi,

I want to check whether the string is valid or not by using Regular Expression and c# asp.net.

This compound string is valid when:

Length of the string = 12;
The first two letters of the string must be = T7 or T8 or TE or TJ or TK or TL or TN or TU or TV or TW or TX or TY;
Third and fourth value of the string must always be 00;
The remaining eight values of the string are only numbers from 0 to 9.

For example this is a valid string

TE0022600014

Instead this is an invalid string

DN10220124A3

Any suggestion, please.

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arjunv

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ANSWER
User: arjunv
Replied: on Apr 06, 2022 08:25 AM
Modified: on Apr 06, 2022 10:46 PM
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Hi georgeacuster...,

Please refer below sample.

Note: I am making this sample with reference from PAN Card Number validation using RegularExpressionValidator in ASP.Net

HTML

<style type="text/css">
    .details {
        text-transform: uppercase;
    }

    .error {
        color: Red;
    }
</style>

<asp:TextBox ID="txtDetails" runat="server" CssClass="details" />
<asp:RegularExpressionValidator ID="rgxPANCard" runat="server" ValidationExpression="([A-Z]){1}([0-9 A-Z]){1}([00]){2}([0-9]{8})$" 
    ControlToValidate="txtDetails" ErrorMessage="Invalid input" CssClass="error"></asp:RegularExpressionValidator>
<hr />
<asp:Button ID="btnSubmit" Text="Submit" runat="server" />

Screenshot

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Validate custom string using ASP.Net Regular Expressions

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