mouse over text event in richtextbox using c#

private void richTextBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)

// Determine whether the user clicks the left mouse button and whether it is a double click.
            if (e.Clicks == 1 && e.Button == MouseButtons.Left)
            {
                // Obtain the character index where the user clicks on the control.
                int positionToSearch = richTextBox1.GetCharIndexFromPosition(new Point(e.X, e.Y));

but instead of MouseDown you would use the MouseOver event.
and from that point, if you have the position, you could get text from the left and right of it, and use regular expressions to find out if it is a word your mouse is at.

I have it from this example:
http://msdn.microsoft.com/en-us/library/system.windows.forms.richtextbox.getcharindexfromposition.aspx[^]

I also think that someone has implemented this already using a MouseOver event:

http://forums.devx.com/showthread.php?t=143645[^]