php截取特定段落怎么操作

//针对视频链接处理

function url_1($str)

{

$ubb_search = array("/http:\/\/(v
------解决方案--------------------
www).youku.com\/v_show\/id_(.+?).html/i",//1

"/http:\/\/v.ku6.com\/show\/(.+?).html/i",//2

"/http:\/\/www.tudou.com\/programs\/view\/(.+?)\//i",//3

"/http:\/\/you.video.sina.com.cn\/b\/(.+?)-(.+?).html/i",//4

"/http:\/\/(.+?).joy.cn\/video\/(.+?).htm/i",//5

"/http:\/\/www.openv.com\/play\/(.+?).html/i",//6

"/http:\/\/video.pomoho.com\/ent\/(.+?)/i",//7

"/http:\/\/www.weplay.cn\/c2\/(.+?).html/i",//8

"/http:\/\/v.blog.sohu.com\/u\/vw\/(.+?)/i",//9

//"/http:\/\/vlog.17173.com\/v\/(.+?)\/(.+?)\/(.+?)\/(.+?)/i",//10

"/http:\/\/www.letv.com\/ptv\/vplay\/(.+?)/i",//11

"/http:\/\/tv.mofile.com\/([^\[\
"/http:\/\/www.boosj.com\/(.+?).html/i",//13

"/http:\/\/www.bobmy.com\/FlvMovie\/VIEW(.+?).html/i",//14

"/http:\/\/v.xgo.com.cn\/(.+?)\/(.+?).html/i",//15

"/http:\/\/play.hupo.tv\/tv\/(.+?).html/",//16

"/http:\/\/www.nnbbaa.com\/player.php\?id=(.+?)/",//16

"/http:\/\/mv.2u.com.cn\/detail_(.+?).html/",//18

"/http:\/\/vsearch.cctv.com\/plgs_play-(.+?).html/",//19

 );

	$ubb_replace = array("",//1


	 );

	$str_1 = preg_replace($ubb_search, $ubb_replace, $str);



if($str !=$str_1){

$str='推荐:';}

else{

$str='';

}

return $str;

}

$w1=" http://you.video.sina.com.cn/b/25323843-1272884840.html";

$w2="http://v.youku.com/v_show/id_XMzIzNjA2NjE2.html";

preg_match('/\/(\d+)-/',$w1,$m1);

preg_match('/id_(.+?)\./',$w2,$m2);

echo $m1[1];

echo '
';

echo $m2[1];