Description:
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The behavior described at http://php.net/manual/en/regexp.reference.unicode.php seems to have changed between PHP 5.2.8 and 5.2.10 (don't know about 5.2.9). I use preg_match() with a \p regexp to check if a character is a letter (or a number, in this case), and this seems to fail for wide characters in 5.2.10.

Reproduce code:
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echo preg_match('/^[\pL\pN]$/', '?');

Expected result:
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1

Actual result:
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PHP 5.2.8: 1
PHP 5.2.10: 0