Salut,
colle ce code dans un module Macro
Sub try()
Range("E1").Select
Do Until ActiveCell.Row = Range("E" & Rows.Count).End(xlUp).Row
If IsEmpty(ActiveCell) Then
ActiveCell = Right(ActiveCell.Offset(, -4), 6)
ActiveCell.Font.Color = vbRed
End If
ActiveCell.Offset(1, 0).Select
Loop
End Sub