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#  Need perl to be built with DEBUGGING
perl -Dr -e '$p = qr{\Q ++ \E} ; $q = qr{\Q ++ \E}x ; $r = qr{\Q++\E}'
...
Freeing REx: `"\\ \\+\\+\\ "'
Freeing REx: `"\\ \\+\\+\\ "'
Freeing REx: `"\\+\\+"'