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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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%s: Eval-group not allowed, use re 'eval'

(F) A regular expression contained the (?{ ... }) zero-width assertion, but that construct is only allowed when the use re 'eval' pragma is in effect. See 11.3.

ISBN 9781906966027Perl Language Reference ManualSee the print edition