Find Text

[Rally2000]

Hi all!
I’m in need of some assistance, and I hope that someone will explain this to me.
I have added a search feature to my Text Pad but I cannot find any reference for what I’m trying to do.
The first thing is a check box that when checked, will only display an exact match.
The next thing would be 2 radio buttons in a group box. Obviously, one of which is up and the other one is down. And maybe, if someone feels like explaining it, I would also like to know how I can replace all instances of a word at one time.
Here is the code that I'm using now.

Private Sub cmdFind_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdFind.Click
        Dim fMain As New frmMain
        fMain = CType(Me.Owner, frmMain)
        Dim lstr As String = fMain.tb1.Text()
        Dim lstrFind As String = cmbFind.Text
        Dim lintSelStart As Int64 = lstr.IndexOf(lstrFind, lintLastIndex)
        If lintSelStart = -1 Then
            fMain.tb1.Select(0, 0)
            lintLastIndex = 0
        Else
            fMain.tb1.Select()
            fMain.tb1.Select(lintSelStart, lstrFind.Length)
            lintLastIndex = lintSelStart + 1
        End If
 
    End Sub
 
    Private Sub cbCase_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cbCase.CheckedChanged
        If cbCase.Checked Then
            'To do: need code to display only exact match
        End If
    End Sub
 
    Private Sub cmdReplace_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdReplace.Click
        Dim fMain As New frmMain
        fMain = CType(Me.Owner, frmMain)
        fMain.tb1.SelectedText = tbReplace.Text
    End Sub
 
    Private Sub cmdCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdCancel.Click
        Me.Close()
    End Sub

Thanks in advance for any help!