Hello, sorry for contacting you directly, i'd appreciate some help.
I found out that the PCRE library used with PHP is not case insensitive for Greek characters when used with the "/i" parameter, while it works fine with English.
I opened a bug report with PHP here:
http://bugs.php.net/bug.php?id=47480
Uppon further investigation, it is apparent that the PCRE library requires some extra "logic", or more specificaly a table with the extra Greek characters which are causing the problem.
Please let me know if i can contact a specific developer who can implement the required patch for fully supporting Greek case insensitive matching.
Thank you.