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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
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12.5.1 Unicode classes

\pP (where P is a single letter) and \p{Property} are used to match a character that matches the given Unicode property; properties include things like "letter", or "thai character". Capitalizing the sequence to \PP and \P{Property} make the sequence match a character that doesn't match the given Unicode property. For more details, see 13.2 and "Unicode Character Properties" (perlunicode) in the Perl Unicode and Locales Manual.

Mnemonic: property.

ISBN 9781906966027Perl Language Reference ManualSee the print edition