How to make the RegEx below ignore only the first instance it finds for this characte

How to make the RegEx below ignore only the first instance it finds for this character " = " and continue with the rest of the file.


            Dim MyRegEx As New Regex("=\s+(?<MyPat>[0-9]*[\+.]*[0-9]*)")
            Dim s As String = txtDataView.Text
            Dim Mc As MatchCollection = MyRegEx.Matches(s)
            Dim M As Match
            Dim i As Integer
            If Mc.Count > 0 Then
                i = 0
                For Each M In Mc
                    i += 1
                    PutInTextBox(Me, "TextBox" & CStr(i), M.Groups("MyPat").Value)
                Next

Private Sub PutInTextBox(ByVal ContainerCtrl As Control, ByVal TBName As String, ByVal msg As String)
        Dim ctl As Control
        For Each ctl In ContainerCtrl.Controls
            If TypeOf ctl Is TextBox And ctl.Name = TBName Then
                ctl.Text = msg
                Exit For
            Else
                PutInTextBox(ctl, TBName, msg)
            End If
        Next
    End Sub