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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
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Useless (?-%s) - don't use /%s modifier in regex; marked by <-- HERE in m/%s/

(W regexp) You have used an internal modifier such as (?-o) that has no meaning unless removed from the entire regexp:

if ($string =~ /(?-o)$pattern/o) { ... }

must be written as

if ($string =~ /$pattern/) { ... }

The <-- HERE shows in the regular expression about where the problem was discovered. See 11.

ISBN 9781906966027Perl Language Reference ManualSee the print edition