怎么写正则表达式啊

Question

<img src="http://g3.ykimg.com/0100641F46517F89EA4F83089A8A5D630DED16-0750-707F-A7E2-9E3ECF173D95" border="0" width="120" height="90" vspace="4" hspace="4" title="00000"/>我想要获取
http://g3.ykimg.com/0100641F46517F89EA4F83089A8A5D630DED16-0750-707F-A7E2-9E3ECF173D95

Answer 1

$s = '<img src="http://g3.ykimg.com/0100641F46517F89EA4F83089A8A5D630DED16-0750-707F-A7E2-9E3ECF173D95" border="0" width="120" height="90" vspace="4" hspace="4" title="00000"/>';
preg_match('/src="(.+)"/U', $s, $r);
echo $r[1];http://g3.ykimg.com/0100641F46517F89EA4F83089A8A5D630DED16-0750-707F-A7E2-9E3ECF173D95