=item Can't find %s character property "%s"
(F) You used C<\p{}> or C<\P{}> but the character property by that name
-could not be found. Maybe you misspelled the name of the property
-(remember that the names of character properties consist only of
-alphanumeric characters), or maybe you forgot the C<Is> or C<In> prefix?
+could not be found. Maybe you misspelled the name of the property?
+See L<perluniprops/Properties accessible through \p{} and \P{}>
+for a complete list of available properties.
=item Can't find label %s
=item Can't find Unicode property definition "%s"
(F) You may have tried to use C<\p> which means a Unicode property (for
-example C<\p{Lu}> is all uppercase letters). If you did mean to use a
-Unicode property, see L<perlunicode> for the list of known properties.
+example C<\p{Lu}> matches all uppercase letters). If you did mean to use a
+Unicode property, see
+L<perluniprops/Properties accessible through \p{} and \P{}>
+for a complete list of available properties.
If you didn't mean to use a Unicode property, escape the C<\p>, either
by C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
possible C<\E>).
(W utf8) Certain codepoints, such as U+FFFE and U+FFFF, are defined by the
Unicode standard to be non-characters. Those are legal codepoints, but are
reserved for internal use; so, applications shouldn't attempt to exchange
-them. If you know what you are doing you can turn off this warning by
-C<no warnings 'utf8';>.
+them. In some cases, this message is also given if you use a codepoint that
+isn't in Unicode--that is it is above the legal maximum of U+10FFFF. These
+aren't legal at all in Unicode, so they are illegal for interchange, but can be
+used internally in a Perl program. If you know what you are doing you can turn
+off this warning by C<no warnings 'utf8';>.
=item Unknown BYTEORDER
0xDFFF (inclusive). That range is reserved exclusively for the use of
UTF-16 encoding (by having two 16-bit UCS-2 characters); but Perl
encodes its characters in UTF-8, so what you got is a very illegal
-character. If you really know what you are doing you can turn off
+character. If you really really know what you are doing you can turn off
this warning by C<no warnings 'utf8';>.
=item Value of %s can be "0"; test with defined()