Regex to check input format

[Lovella Bacaud]

Hi telerik

I use a radtextbox and i want to validate user input of following format
123#, 5677#. User can enter numbers followed by a mandatory #. How to validate this with regex?

Any suggestion
Lovella

[Shinu]

Hi Lovella,

You can use the ASP RegularExpressionValidator to achieve your requirement. Please check the following mark-up.

ASPX:

<telerik:RadTextBox ID="RadTextBox1" runat="server">
</telerik:RadTextBox>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" Display="Dynamic"
    ErrorMessage="*" ForeColor="Red" ValidationExpression="^\d+#" ControlToValidate="RadTextBox1">
</asp:RegularExpressionValidator>

Thanks,
Shinu.

[Lovella Bacaud]

It worked well. Can I display an invalid symbol in the textbox if the validation fails?

[Shinu]

Hi Lovella,

You can use an ASP CustomValidator to achieve your requirement.

ASPX:

<telerik:RadTextBox ID="RadTextBox2" runat="server">
    <ClientEvents OnFocus="OnFocus" />
</telerik:RadTextBox>
<asp:CustomValidator ID="CustomValidator1" runat="server" ControlToValidate="RadTextBox2"
    ForeColor="Red" ClientValidationFunction="validateText"></asp:CustomValidator>

JavaScript:

<script type="text/javascript">
    function validateText(sender, args) {
        var textboxvalue = args.Value;
        if (!textboxvalue.match('^[0-9]+#$')) {
            args.IsValid = false;
            $find('<%=RadTextBox2.ClientID %>')._invalid = true;
        }
        else {
            args.IsValid = true;
            $find('<%=RadTextBox2.ClientID %>')._invalid = false;
        }
    }
    function OnFocus(sender, args) {
        if (sender._invalid == true) {
            sender.clear();
        }
    }
</script>

Thanks,
Shinu.

[Lovella Bacaud]

Shinu, thanx for your kind support and I got it to work nicely. Like to tweak a little bit. Can you help me to remove that invalid icon if the textfield is empty?

[Shinu]

Hi Lovella,

Please have a look into the following code I tried which works fine at my end.

JavaScript:

function OnFocus(sender, args) {
    if (sender._invalid == true) {
        sender._invalid = false;
        sender.clear();
    }
}

Thanks,
Shinu.

[Sankalp]

Hi i want a reqular expression which will allow everything along with enter for Validationexpression