Question

I’m trying to validate an ASP TextBox that can only have 1-2 digits (not zero) using the following regex:

^[1-9]{1,2}

This regex doesn’t validate if the field is empty (assumed it would due to the 1-2 part)

Also tried ^[1-9+]{1,2} to no avail.

These are my controls:

<asp:TextBox ID="txtInHour" 
             MaxLength="2" 
             runat="server" 
             Text='<%# Bind("InHour") %>' 
            Width="80"/>


<asp:RegularExpressionValidator ID="rvInHour" 
                ControlToValidate="txtInHour" 
                Display="None" 
                ValidationExpression="^[1-9]{0,2}$" 
                runat="server" 
                ErrorMessage="InHour is incorrectly formatted." />  

Answer 1

I found out that for some reason RegularExpressionValidators don’t work when there’s no input to match against (blank fields) so I had to use a seperate RequiredFieldValidator. Thanks for your input everyone!