I found a manual page which seems to be related my problem.
http://jp.php.net/manual/en/regexp.reference.php
According to the description,
the \p, \P and \X are available when UTF-8 mode is selected.
The preg functions use PCRE.
I ran the pcretest by terminal, and set the regex of
Varidation::alphaNumeric
(/cake/libs/validation.php line 169). The followings are the result.
-------------
$ pcretest
PCRE version 6.6 06-Feb-2006
re> /^[\p{Ll}\p{Lm}\p{Lo}\p{Lt}\p{Lu}\p{Nd}]+$/mu
** Unknown option 'u'
-------------
http://www.pcre.org/pcre.txt says:
"The current implementation of PCRE (release 7.x) corresponds
approxi-
mately with Perl 5.10, including support for UTF-8 encoded strings
and
Unicode general category properties. However, UTF-8 and Unicode
support
has to be explicitly enabled; it is not the default."
So, I guess that the reason why the validation won't work is
because I installed PHP (and PCRE) using RPM (by yum), and
the PCRE was compiled with default setting.
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