怎样用正则匹配电话号手机号和邮箱网址

$str = "<a href=&#39;http://www.baidu.com&#39; target=&#39;_blank&#39;>百度</a>http://www<a href=&#39;http://www.sina.com&#39; target=&#39;_blank&#39;>新浪</a>kod"; 
preg_match_all("/<a href=([\"\&#39;])(http:\/\/([\w\d\.])+)[^>]*>(.*?)<\/a>/i", $str, $matches); 
echo "<pre class="brush:php;toolbar:false">"; 
var_dump($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);