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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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Nested quantifiers in regex; marked by <-- HERE in m/%s/

(F) You can't quantify a quantifier without intervening parentheses. So things like ** or +* or ?* are illegal. The <-- HERE shows in the regular expression about where the problem was discovered.

Note that the minimal matching quantifiers, *?, +?, and ?? appear to be nested quantifiers, but aren't. See 11.

ISBN 9781906966027Perl Language Reference ManualSee the print edition