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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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!=~ should be !~

(W syntax) The non-matching operator is !~, not !=~. !=~ will be interpreted as the != (numeric not equal) and ~ (1's complement) operators: probably not what you intended.

ISBN 9781906966027Perl Language Reference ManualSee the print edition