A regex quantifier combination like  ++ is illegal in Perl 5.8, but is supported in 5.10 et seq. See discussion of 'possessive' quantifiers in Quantifiers section of perlre (for 5.10++ of course).

In reply to Re^2: What does it mean Nested quantifiers in regex by AnomalousMonk
in thread What does it mean Nested quantifiers in regex by anakin30

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