php截取特定段落怎么操作

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//针对视频链接处理<br />
function url_1($str)<br />
{<br />
$ubb_search = array("/http:\/\/(v<br><font color='#FF8000'>------解决方案--------------------</font><br>www).youku.com\/v_show\/id_(.+?).html/i",//1<br />
"/http:\/\/v.ku6.com\/show\/(.+?).html/i",//2<br />
"/http:\/\/www.tudou.com\/programs\/view\/(.+?)\//i",//3<br />
"/http:\/\/you.video.sina.com.cn\/b\/(.+?)-(.+?).html/i",//4<br />
"/http:\/\/(.+?).joy.cn\/video\/(.+?).htm/i",//5<br />
"/http:\/\/www.openv.com\/play\/(.+?).html/i",//6<br />
"/http:\/\/video.pomoho.com\/ent\/(.+?)/i",//7<br />
"/http:\/\/www.weplay.cn\/c2\/(.+?).html/i",//8<br />
"/http:\/\/v.blog.sohu.com\/u\/vw\/(.+?)/i",//9<br />
//"/http:\/\/vlog.17173.com\/v\/(.+?)\/(.+?)\/(.+?)\/(.+?)/i",//10<br />
"/http:\/\/www.letv.com\/ptv\/vplay\/(.+?)/i",//11<br />
"/http:\/\/tv.mofile.com\/([^\[\<\r\n]+?)\//i",//12<br />
"/http:\/\/www.boosj.com\/(.+?).html/i",//13<br />
"/http:\/\/www.bobmy.com\/FlvMovie\/VIEW(.+?).html/i",//14<br />
"/http:\/\/v.xgo.com.cn\/(.+?)\/(.+?).html/i",//15<br />
"/http:\/\/play.hupo.tv\/tv\/(.+?).html/",//16<br />
"/http:\/\/www.nnbbaa.com\/player.php\?id=(.+?)/",//16<br />
"/http:\/\/mv.2u.com.cn\/detail_(.+?).html/",//18<br />
"/http:\/\/vsearch.cctv.com\/plgs_play-(.+?).html/",//19<br />
 );<br />
	$ubb_replace = array("",//1<br />
<br />
	 );<br />
	$str_1 = preg_replace($ubb_search, $ubb_replace, $str);<br />
<br />
<br />
if($str !=$str_1){<br />
$str='<img  src=/templates/dian_1.gif alt=" php截取特定段落怎么操作 " >推荐:';}<br />
else{<br />
$str='<img  src=/templates/dian.gif alt=" php截取特定段落怎么操作 " >';<br />
}<br />
return $str;<br />
}<br />
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$w1=" http://you.video.sina.com.cn/b/25323843-1272884840.html";<br />
$w2="http://v.youku.com/v_show/id_XMzIzNjA2NjE2.html";<br />
preg_match('/\/(\d+)-/',$w1,$m1);<br />
preg_match('/id_(.+?)\./',$w2,$m2);<br />
echo $m1[1];<br />
echo '<br>';<br />
echo $m2[1];