This depends on the language, and apparently can conflict with unicode, but take a look at perldoc perllocale (sepecifically, the section on LC_CTYPE)

I haven't used locales at all, so I can't really help you any further than that.

Edit: fixed url.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: ISO 8859-1 characters and \w \b etc. by Joost
in thread ISO 8859-1 characters and \w \b etc. by Melroch

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