How to use php to intercept a specific paragraph

Php intercepts a specific paragraph how to operate such as the user input a string of characters through the text box the first input content: $ w1 = "& nbsp; http://you.video.sina.com.cn/ B /25323843-1272884840.html"; the second input content: $ w2 = php: how to intercept a specific section
For example, you can enter a string of characters in the text box.
Content entered for the first time: $ w1 = "http://you.video.sina.com.cn/ B /25323843-1272884840.html ";
Second input: $ w2 = "http://v.youku.com/v_show/id_XMzIzNjA2NjE2.html ";


First result: $ val = "25323843 ";
The second result: $ val = "XMzIzNjA2NjE2 ";

Assuming that the above two values are entered by the user separately, how does the program automatically extract the values I need? Can you give an example?


Could you please help me to share with us:
------ Solution --------------------

// Video link processing
Function url_1 ($ str)
{
$ Ubb_search = array ("/http: \// \/(v
------ Solution --------------------
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 \/([^ \ [\ <\ r \ n] + ?) \ // I ", // 12
"/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 \/(. + ?). 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 = 'Recommendation :';}
Else {
$ Str = '';
}
Return $ str;
}

For reference
------ Solution --------------------

$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];

25323843
XMzIzNjA2NjE2