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问一个正则,该如何解决

WBOY
Release： 2016-06-13 13:48:10
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问一个正则

PHP code
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
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-->
//匹配一个简单的URL
$reg = '/(http:\/\/)?(.*\.)*[(com)|(cn)|(net)]/';
$str = 'www.baidu.com/1/2/3/4/5/6';

preg_match($reg, $str, $match);
var_dump($match);
Copy after login


问题：
为什么打印$match结果是：
array(3) { [0]=> string(11) "www.baidu.c" [1]=> string(0) "" [2]=> string(10) "www.baidu." } 

只匹配到了www.baidu.c ???


谢谢！

------解决方案--------------------
探讨
[]的意思不就是取中括号中任意一个原子吗？如果不加+号，不就说明要她们中的一个必须且只能出现一次吗？
Related labels：
match quot string
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