One of my great regrets is that you cant use Perl as Excels macro language.
But you can...
Update: I'm posting the text of that link here, because I think its valuable to have in more than one place:
If you haven't got the Microsoft Script Control, download it from some
+where in http://msdn.microsoft.com/scripting [microsoft.com].
Then in Excel, set Tools - References - Microsoft Script Control.
In your code, you can now eval and execute Perl code, and use it in an
+y Functions that you've declared as public - here's a trivial example
Private sc As New ScriptControl
Public Function uc(txt As String) As String
sc.Language = "PerlScript"
uc = sc.Eval("uc(" & txt & ")")
Now you can type =uc("hello") in your spreadsheet to call the above fu
You can even use modules; I had an example using Lingua::EN::Numbers,
+but I can't lay my hands on it at the moment.
Hope this helps.