Try making your copy/paste start with the period (i.e omit
http://www). If the paste starts with the period, you won't get the unwanted space. Similarly, if the copied string terminates in a '/', a trailing space isn't inserted.
An alternative would be to use a macro:
Code:
Private Sub PasteUnformattedText()
Dim MyData As DataObject
On Error GoTo ErrExit
Set MyData = New DataObject
MyData.GetFromClipboard
Selection.Range.Text = MyData.GetText
ErrExit:
End Sub
The above macro has broader application than your html coding, being useful for any unformatted text pasting. Simply assign it to a keyboard shortcut.