The possessive form, PAT++ is short hand for (?>PAT+), from perlre
Possessive quantifiers are equivalent to putting the
item they are applied to inside of one of these constructs.
The following equivalences apply:
Quantifier Form Bracketing Form
--------------- ---------------
PAT*+ (?>PAT*)
PAT++ (?>PAT+)
PAT?+ (?>PAT?)
PAT{min,max}+ (?>PAT{min,max})
In your case m/$re++\d/ == m/(?>$re+)\d/, just prettier;)
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