Find Text

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.

VB Code:

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!

Well, I don't have time to conjure up code for you, sorry.

But I could give you what I would say is the roadmap I would employ.

Basically, you will have to examine your document by starting at the beginning character, shifting forward one character at a time, toward the end (Count), pausing whenever a match is found.

So... a search for hat would return..

medhat, hate, hatch

If its an exact match (whole word only), things get just a tad bit more involved, in that you need to check if the match has either:
1) hat! (space plus punctuation)
2) .Hat (punctuation plus space)
3) hat (with two spaces on either side)
4) hat (space, and the word hat being the last three characters of the document)

There are a few helpful functions of the Char class called IsPunctuation , IsSeperator, IsWhiteSpace that will return true on punctuation and spaces, and you can easily check if hat is at the end of a document with a space before it as well.

Have fun!