$str = "<a href='http://www.baidu.COM' target='_blank'>百度</a>http://www<a href='http://www.sina.com' target='_blank'>新浪</a>kod";

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

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

$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]);

$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);