perl .*?和.*

redis01:/root# cat x2.pl
my $str="212121a19823a456123";
if ($str =~/.*a(.*)23/){print "1----".$1."\n";};
if ($str =~/.*?a(.*)23/){print "2----".$1."\n";};
redis01:/root# perl x2.pl
1----4561
2----19823a4561