PCRE in FC6 is not built with the --enable-unicode-properties option. Without
this option the \P, \p, and \X sequences that recognize Unicode character
properties are not supported.
This effects PHP since the Unicode sequences as documented at
do not work.
These sequences are very useful for validating form input.
More information available at:
it's now fixed in rawhide. I will build it for FC5/FC6 update soon. Thanks for