本文章收集了三种关于从字符串或文章内容中匹配url正则表达式的php代码，前二种函数是获取以域名为标题的http，后一种是匹配内容中的url地址并且保存到数组中哦。
//方法一
$ereg_str[url] = "^[hh]{1}[tt]{2}[pp]{1}://[ww]{3}.[0-9a-za-z][0-9a-za-z-]{0,25}((.[a-za-z]{3,4})|(.[a-za-z]{2})){1,2}$ ";//判断一个合法的url
$pattern = $ereg_str['url'];
if(ereg($pattern,$string)) echo "
right! ";
else echo "
error! ";
}
//
$str[] = "";
$pattern = '/^(http://)?www.[0-9a-z][0-9a-z-]{0,25}((.(aero|biz|cc|co|com|coop|edu|gov|info|int|mil|museum|name|nato|net|org|tv))?(.(af|aq|at|au|be|bg|br|ca|ch|cl|cn|de|eg|es|fi|fr|gr|hk|hu|ie|il|in|iq|ir|is|it|jp|kr|mx|nl|no|nz|pe|ph|pr|pt|ru|se|sg|th|tr|tw|uk|us|za))?){1}$/i ';
foreach($str as $key=> $val)
{
$key ;
if(preg_match($pattern,$val))
echo " right! ".$val;
else
echo " error! ".$val;
}
//方法三
//匹配yyyyyy
"/([^].*)/i"
//匹配href="xxxxxx"
s*([^
$reg = "[^"']*)2)|(?[^s>] ))[ss]*?>";
?>
