use warnings;
use strict;

my $rx_qr = qr/(?:(?|(?:\")([^\\\"]*(?:\\.[^\\\"]*)*)(?:\")))/;
my $rx_qq = qq/(?:(?|(?:\")([^\\\"]*(?:\\.[^\\\"]*)*)(?:\")))/;
my $rx__q =  q/(?:(?|(?:\")([^\\\"]*(?:\\.[^\\\"]*)*)(?:\")))/;

print qq{raw qr: $rx_qr \n};
print qq{qr/qq/: }, qr/$rx_qq/, "\n";
print qq{qr/q/ : }, qr/$rx__q/, "\n";