How to validate a text field with a custom validation with a Regular Expression?

Hi !

I have a custom validation with a regular expression to check if the text typed in a text box is correct. But I don' t know how to check if it' s correct the text typed with the regular expression. For instance, according to my RegExp, if somebody type 'B2583691' is correct (1 letter and 7 numbers), but 'A123456' isn' t correct (1 letter and 6 numbers).
Now I do it with the 'match' class, but I think that isn' t correct for my purpose.

Nobody knows how can I do this kind of validation?

My Sub:

Code:

---

Sub ServerVal_id(sender As Object, value As ServerValidateEventArgs)

  Try

    Dim kindId As Integer
    kindId = var_id.SelectedItem.Value   
    Dim id As String
    id = idNumber.Text()   
    Dim patNum As String = "^[ABCDEFGHKLMNPQS]{1}[0-9]{7}$"
    Dim n As New Regex(patNum)


    If (kindId = 1) Then

        Dim checkNum As Match = n.Match(id)

        If checkNum.Success Then
          value.IsValid = True
        Exit Sub

            Else

            value.IsValid = False               

        End If
    ...
  End If

  Catch exc As Exception
  End Try
End Sub

---

Then in the control:

Code:

---

<asp:CustomValidator id="CustomValidator2" runat="server" ControlToValidate="idNumber" OnServerValidate="ServerVal_id" Display="Dynamic">Incorrect format for kind 1.
</asp:CustomValidator>

---

Why not use the RegularExpressionValidator control for this?

Because the validation depends on the selection in a 'dropdownlist'. If the user selects 1 he/she needs to type a pattern into a text box, if user selects 2 she/he needs to type a different pattern. The error message will be different in both cases.
So it's a little bit more complex. Isn' t it?

I'm guessing what you're asking for is the RegEx to help you validate the expression.

Other than the expression consisting of one letter and seven numbers, the only other requirement I can infer is that the first character must be a letter (between A-S, minus I,O,R), and the match must end in 7 consecutive digits.

Correct?

Javascript regex:

/^[(A|B|C|D|E|F|G|H|J|K|L|M|N|P|Q|S){1}]\d{7}$/

I know the meaning of my RegExp. I suppose that the meaning is the same with 'javascript' than in 'asp.net vb.net'... Because I have copied it from a javascript function.

Has the RegExp the same language-meaning in javascript than in asp.net vb.net?

Now my Subroutine runs, I have 'found' the problem, but it is something very strange and I need to solve it :( . If I erase all the server control validations from the page except the custom validation, the custom validation runs. It is really very strange...

Any ideas?