I have a RTB that loads data from a file like this in the Load event of the Form2

Code:
Me.rtb_cerere.LoadFile(Application.StartupPath & "\ceelceur.rtf")
After i load this file i want to replace some key words with a specified text but here i'm stuck...

I use this...

Code:
    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click

        Dim PozitieCurenta As Integer = Me.rtb_cerere.SelectionStart
        Dim SelectieCurenta As Integer = Me.rtb_cerere.SelectionLength
        Dim CuvantCheie As String = "{1}"

        Me.rtb_cerere.Select(StartPosition - 1, CuvantCheie.Length)
        Me.rtb_cerere.ScrollToCaret()
        Me.Focus()

        Me.rtb_cerere.Rtf = Replace(Me.rtb_cerere.Rtf, Trim(CuvantCheie), Trim("TEST"))
        Me.rtb_cerere.SelectionStart = PozitieCurenta
        Me.rtb_cerere.SelectionLength = SelectieCurenta
        Me.Focus()

    End Sub
How can i replace this {1} with "TEST" ? I have spend 2 days and i'm lost in the space!

Thanks...