Hi, Thomas. Thank you for response and you are right - pcre was the case. I don't know why but the rpm distribution had UTF support turned on, but with no Unicode properties support as described in this issue on bugtracker http://framework.zend.com/issues/browse/ZF-1641 ZF-1641 , probably people who did the rpm forgot about this option.
Anyway for anyone who may come across this issue here's what needs to be done: 1. checkout the rpm 2. patch it with the -enable-utf8 --enable-unicode-properties options 3. reinstall. All the necessary steps in detail are decribed in http://gaarai.com/2009/01/31/unicode-support-on-centos-52-with-php-and-pcre/ this article . Thanks again and good luck, Dmitry. -- View this message in context: http://n4.nabble.com/Alnum-validation-fails-tp1476726p1554303.html Sent from the Zend Framework mailing list archive at Nabble.com.