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Re: Regex Matching Unicode and Regex Classes

by moritz (Cardinal)
on Nov 02, 2011 at 14:08 UTC ( #935405=note: print w/ replies, xml ) Need Help??


in reply to Regex Matching Unicode and Regex Classes

The default Unicode semantics just check the Unicode properties of a codepoint. "" is U+00E4 LATIN SMALL LETTER A WITH DIAERESIS and classified as a letter, so \w matches it.


Comment on Re: Regex Matching Unicode and Regex Classes
Re^2: Regex Matching Unicode and Regex Classes
by McA (Deacon) on Nov 02, 2011 at 14:27 UTC
    Hi Moritz,

    but what is then the difference to the third case? Is the "default Unicode semantic" changed to something different when local is enabled?

    Why is "U+00E4 LATIN SMALL LETTER A WITH DIAERESIS" under locale something different than a letter which is part of a word?

    Best regards
    Andreas

      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).

        Hi Moritz,

        that sounds plausible, but not satisfying. ;-)

        What is then the right approach to find word boundaries with regex while locale is enabled?

        Best regards
        Andreas

Re^2: Regex Matching Unicode and Regex Classes
by McA (Deacon) on Nov 02, 2011 at 15:00 UTC
    Moritz,

    thanky ou for your answers.
    Have a nice day.

    Best regards
    Andreas

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