To by honest, I don't remember. And it is possible that I used that construct redundantly or I used it with wrong faith that after possessive quantifier succeeds then all backtrackings are disabled from this point (but for real backtrackings are disabled only in that group).
Today I failed to imagine practical example where this atomic/possessive construct could be used.

In reply to Re^7: about style: use possessive or atomic? by rsFalse
in thread about style: use possessive or atomic? by rsFalse

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