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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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28.1.11 Character sets and character encoding

Assume very little about character sets.

Assume nothing about numerical values (ord, chr) of characters. Do not use explicit code point ranges (like \xHH-\xHH); use for example symbolic character classes like [:print:].

Do not assume that the alphabetic characters are encoded contiguously (in the numeric sense). There may be gaps.

Do not assume anything about the ordering of the characters. The lowercase letters may come before or after the uppercase letters; the lowercase and uppercase may be interlaced so that both "a" and "A" come before "b"; the accented and other international characters may be interlaced so that ä comes before "b".

ISBN 9781906966027Perl Language Reference ManualSee the print edition