c:\@Work\Perl\monks>perl
use strict;
use warnings;

my $s = 'foo "xyzzy" bar';

print qq{+? (lazy) quantifier with final ":    matched '$1' \n} if $s =~ /"([^"]+?)"/;
print qq{+? (lazy) quantifier without final ": matched '$1' \n} if $s =~ /"([^"]+?)/;

__END__
+? (lazy) quantifier with final ":    matched 'xyzzy'
+? (lazy) quantifier without final ": matched 'x'