Levenstein a EXCEL

 Function Levenshtein(ByVal string1 As String, ByVal string2 As String) As Long

Dim i As Long, j As Long
Dim string1_length As Long
Dim string2_length As Long
Dim distance() As Long

string1_length = Len(string1)
string2_length = Len(string2)
ReDim distance(string1_length, string2_length)

For i = 0 To string1_length
    distance(i, 0) = i
Next

For j = 0 To string2_length
    distance(0, j) = j
Next

For i = 1 To string1_length
    For j = 1 To string2_length
        If Asc(Mid$(string1, i, 1)) = Asc(Mid$(string2, j, 1)) Then
            distance(i, j) = distance(i - 1, j - 1)
        Else
            distance(i, j) = Application.WorksheetFunction.Min _
            (distance(i - 1, j) + 1, _
             distance(i, j - 1) + 1, _
             distance(i - 1, j - 1) + 1)
        End If
    Next
Next

Levenshtein = distance(string1_length, string2_length)

End Function