>>>>> "Tom" == Tom Lane <[EMAIL PROTECTED]> writes:

 > Andrew Gierth <[EMAIL PROTECTED]> writes:
 >> Obviously, this happens because the locale support functions in
 >> backend/regex/regc_locale.c are (presumably intentionally)
 >> crippled so as not to support non-ascii chars, despite all the
 >> code there using wide chars for everything otherwise.

 Tom> It's not so much intentional as that no one has gotten around to
 Tom> making it work.  The difficulty is that the wide-char codes we
 Tom> are using might not match what the <wctype.h> functions expect,
 Tom> and it's unclear what we could do to fix that.

Couldn't we follow the example of lower(), and convert the string to
wchar_t using mbstowcs (rather than pg_wchar_t and pg_mb2wchar)?

This obviously requires that we have a matching lc_ctype for the
encoding, but we insist on that now anyway, no?

-- 
Andrew.

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