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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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Reference to invalid group 0

(F) You used \g0 or similar in a regular expression. You may refer to capturing parentheses only with strictly positive integers (normal backreferences) or with strictly negative integers (relative backreferences), but using 0 does not make sense.

ISBN 9781906966027Perl Language Reference ManualSee the print edition