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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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Verb pattern '%s' has a mandatory argument in regex; marked by <-- HERE in m/%s/

(F) You used a verb pattern that requires an argument. Supply an argument or check that you are using the right verb.

ISBN 9781906966027Perl Language Reference ManualSee the print edition