Sub VerifClient()
Dim tb(), client As String, NewClient As String, C As Range, n As Long
client = "client à trouver"
NewClient = Trim(UCase(SANSACCENT(client)))
For Each C In ActiveSheet.ListObjects("tclient").ListColumns("nom prenom").DataBodyRange
ReDim Preserve tb(n)
tb(n) = Trim(SANSACCENT(UCase(C.Value)))
n = n + 1
Next
MsgBox Not IsError(Application.Match(NewClient, tb, 0))
End Sub