复制代码 代码如下:

/*

1 (?s) 代表 Pattern.DOTALL,也就是匹配换行，允许 img里出现在多行

2 .*?代表非贪婪匹配任意字符，直到后面的条件出现

3 ?: 代表这个匹配但不被捕获，也就是不在结果出现 [.gif|.jpg] 是或者的意思

*/

$pattern="/<img.*?src=['|"](.*?(?:[.gif|.jpg]))['|"].*?[/]?>/";

$str='<p><img border="0" src="upfiles/2009/07/1246430143_4.jpg" alt=""/></p><p><img border="0" src="upfiles/2009/07/1246430143_3.jpg" alt=""/></p><p><img border="0" src="upfiles/2009/07/1246430143_1.jpg" alt=""/></p>';

preg_match_all($pattern,$str,$match);

print_r($match);

/*

Array

(

[0] => Array

(

[0] => <img border="0" src="upfiles/2009/07/1246430143_4.jpg" alt=""/>

[1] => <img border="0" src="upfiles/2009/07/1246430143_3.jpg" alt=""/>

[2] => <img border="0" src="upfiles/2009/07/1246430143_1.jpg" alt=""/>

)

[1] => Array

(

[0] => upfiles/2009/07/1246430143_4.jpg

[1] => upfiles/2009/07/1246430143_3.jpg

[2] => upfiles/2009/07/1246430143_1.jpg

)

)

*/