Textbox Validation: Allow only alphabets and simple brackets "(" and ")" vb.net

Question

I want to validate textbox with keyPress event. It should allow alphabets and "(" and ")" I have written code for alphabet check but don't know how to check for "(" and ")".

     Private Sub txtBankName_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txtBankName.KeyPress
    If Not (Asc(e.KeyChar) = 8) Then
        If Not ((Asc(e.KeyChar) >= 97 And Asc(e.KeyChar) <= 122) Or (Asc(e.KeyChar) >= 65 And Asc(e.KeyChar) <= 90) Or Asc(e.KeyChar) = 32) Then
            e.KeyChar = ChrW(0)
            e.Handled = True
        End If
    End If
End Sub

score 1 · Accepted Answer · edited Jan 24 '18 at 15:58

1

This allows all Letters and "(" & ")". Refer to these two SO questions:
How can I validate a string to only allow alphanumeric characters in it?
Only allow specific characters in textbox

Private Sub txtBankName_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txtBankName.KeyPress    
    If System.Text.RegularExpressions.Regex.IsMatch(e.KeyChar.ToString(), "[^a-zA-Z0-9()\b]") Then
       e.Handled = True
    End If
End Sub

edited Jan 24 '18 at 15:58

Paul Karam

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answered Feb 03 '17 at 05:31

Hexxed

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@user3422209 I just converted my C# Code to VB.net. Its just a verbatim string literal. Try my updated code. Just removed "@". – Hexxed Feb 03 '17 at 07:44
Thank you so much.. but this accepts [ ] brackets too.. It shouldn't be accepted – user3422209 Feb 03 '17 at 09:34
@user3422209 There modified it. The string `"[^a-zA-Z0-9()\b]"` denotes the allowed strings to be typed. `\b` Allows backspace to delete characters. – Hexxed Feb 04 '17 at 00:16

Textbox Validation: Allow only alphabets and simple brackets "(" and ")" vb.net

1 Answers1