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})