preg_match_all("/<a href=([\"\'])(http:\/\/([\w\d\.])+)[^>]*>(.*?)<\/a>/i", $str, $matches);

echo "<pre>";
var_dump($matches[2]);
echo "<br />";
var_dump($matches[4]);

匹配邮箱
复制代码代码如下:
$emails = "wangzhanu@126.comha12wangzhanu@163.com";

preg_match_all("/([a-z0-9_\-\.]+)@(([a-z0-9]+[_\-]?)\.)+[a-z]{2,3}/i", $emails, $matches);

var_dump($matches[0]);

匹配手机以及电话号码
复制代码代码如下:
$tel = "13911112222sf010-44444442dfg18811112222";

preg_match_all("/1[3,5,8]{1}[0-9]{1}[0-9]{8}|0[0-9]{2,3}-[0-9]{7,8}(-[0-9]{1,4})?/", $tel, $matches);

var_dump($matches);

正则匹配