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  1. or download this
    my $regex1 = qr/(?:(?|(?:\")([^\\\"]*(?:\\.[^\\\"]*)*)(?:\")))/;
my $regex2 = qq/(?:(?|(?:\")([^\\\"]*(?:\\.[^\\\"]*)*)(?:\")))/;

print $regex1, "\n", qr/$regex2/, "\n";
  2. or download this
    (?^:(?:(?|(?:\")([^\\\"]*(?:\\.[^\\\"]*)*)(?:\"))))
(?^:(?:(?|(?:")([^\"]*(?:\.[^\"]*)*)(?:"))))