how to restrict textbox with specific format using asp.net regular expression validator

I have text which is binded to asp.net regular expression validation. I want max length of character as 13 and want to have format like xx/xxxxx-xxxx

This are valid formats

33/34567-1
33/12345-12
33/12345-123
33/12345-1234

I tried this

<asp:TextBox ID="txt1" runat="server" OnTextChanged="txt1_TextChanged" class="textNormal" MaxLength="13" Width="100"></asp:TextBox> (xx/xxxxx-xxxx)
                    <br />
                    <asp:RegularExpressionValidator ID="regexValidator1" runat="server"
                     ErrorMessage="Must be in format xx/xxxxx-xxxx" ValidationExpression="dd/ddddd-d{4}$"
                    ControlToValidate="txt1">Must be in format xx/xxxxx-xxxx</asp:RegularExpressionValidator>

But its not working as i want. When i type 33/45678-12 then it throws validation error.
only one character after Last part after -is mandatory.

How to fix this?

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Answers:

Method 1

Answers:

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Method 1

You can shorten the 5 digits to d{5} and match 1-4 digits at the end using d{1,4} which will still have a MaxLength="13"

ValidationExpression="dd/d{5}-d{1,4}$"

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