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Short answer: because Unicode and locales don't mix.

Long answer: Perl's support for locales comes from a time before the whole encoding/decoding business and Unicode support. So if locales are active, the locale-sensitive parts expect to act on bytes, not on decoded strings.

Since the locale is not ISO-8859-1 but UTF-8, encoding to Latin-1 doesn't fix it for you.

If anything, you'd need to encode to UTF-8 to see the \w matching , but even then I don't see it matching. So either my understanding of locales is very wrong, or perl is broken (or a mixture thereof).

In reply to Re^3: Regex Matching Unicode and Regex Classes by moritz
in thread Regex Matching Unicode and Regex Classes by McA

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