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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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Invalid version format (multiple underscores)

(F) Versions may contain at most a single underscore, which signals that the version is a beta release. See "new()" (version) in the Perl Library Reference Manual (Volume 1) for the allowed version formats.

ISBN 9781906966027Perl Language Reference ManualSee the print edition