php截取特定段落怎么操作

<br />//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='@@##@@推荐:';}<br />else{<br />$str='@@##@@';<br />}<br />return $str;<br />}<br /><br /><br />

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