[TxMt] how to match unicode?

[Piero D'Ancona]

Writing a ruby command for TextMate to reformat author names
in a list of papers I run into the obvious but sad fact that
/[A-z]/ =~ "ü"
does not match anything.  Is there a simple workaround?
I mean, simpler than a very long and unelegant list of Unicode 
ranges such as the one here
http://forums.mozillazine.org/viewtopic.php?f=25&t=834075

Thanks,
Piero