Making the rules of a text box

[zerofreak]

Hello guys,

I've newly joined this forum since I want to enhance my knowledge in Programming specially in Visual Basic.

So for the important part, right now I'm planning on creating a word detector somehow and there are specific rules I was to set in the textbox in relation with the button.
Let's say I wanna set an IF Statement for the text to have 32 characters and letters "abcdefg" and numbers "12345" so that it'll execute a message box when I press the button.

Here's a code example of what I'm saying

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    If TextBox1.Text.Length.Equals(32) Then
    MessageBox.Show("You word has 32 Characters")
    End If
    End Sub

As you can see, I've set a rule that a message box will pop up if the word has 32 characters.
But I need to set another rule at the same time in which the word will have only letters "abcdefg" and numbers "12345"

Any ideas?
Help would be appreciated
Thanks in advance
[e-mail]

[Jx_Man]

I suggest to trap it when user input the characters.
So, users can only input the specific characters.
Example : (This text box only accept numbers input only)

Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
    If Asc(e.KeyChar) < 48 Or Asc(e.KeyChar) > 57 Then
        e.Handled = True
    End 
    If Asc(e.KeyChar) = 8 Then
        e.Handled = False
    End If
End Sub

[zerofreak]

Thanks mate
I'm gonna give it a try now

[zerofreak]

It worked pretty well
However, I'm still stuck at something

Lets say I want a message box to appear when a specific text like $1$ and other text like abcdefg and the limit of the characters is 32

Is there any specific code for that?

[Reverend Jim]

If TextBox1.Text.Contains("$1$") and TextBox1.Text.Contains("abcdefg") and Len(TextBox1.Text) = 32 then
    MsgBox("hit")
End If

[zerofreak]

If TextBox1.Text.Contains("$1$") and TextBox1.Text.Contains("abcdefg") and Len(TextBox1.Text) = 32 then
    MsgBox("hit")
End If

Thanks a lot for the help
This one helped me a lot
Problem solved