From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Vik Reykja <vikreykja(at)gmail(dot)com> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Notes about fixing regexes and UTF-8 (yet again) |
Date: | 2012-02-19 04:41:55 |
Message-ID: | 13378.1329626515@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Vik Reykja <vikreykja(at)gmail(dot)com> writes:
> On Sun, Feb 19, 2012 at 05:03, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> On Sat, Feb 18, 2012 at 10:38 PM, Vik Reykja <vikreykja(at)gmail(dot)com> wrote:
>>> Does it make sense for regexps to have collations?
>> As I understand it, collations determine the sort-ordering of strings.
>> Regular expressions don't care about that. Why do you ask?
> Perhaps I used the wrong term, but I was thinking the locale could tell us
> what alphabet we're dealing with. So a regexp using en_US would give
> different word-boundary results from one using zh_CN.
Our interpretation of a "collation" is that it sets both LC_COLLATE and
LC_CTYPE. Regexps may not care about the first but they definitely care
about the second. This is why the stuff in regc_pg_locale.c pays
attention to collation.
regards, tom lane
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