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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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Unicode non-character %s is illegal for interchange

(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. 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 no warnings 'utf8';.

ISBN 9781906966027Perl Language Reference ManualSee the print edition