$aaa="1234,5677,3333";$aaa=~/\d+,(\d+),\d+/; #现在$1中就是5677print $1."\n";$bbb="2223,4241,45452";$bbb=~/(\d+),\d+,\d+/; #现在$1中是2223print $1;
$1每次匹配都会被改写的，你的写法有问题吧$bbb=~/(\d+),\d+,\d+/; #
