更好的条带化方法php正则表达式

Question

please help me strip the following more efficiently.

a href="/mv/test-1-2-3-4.vFIsdfuIHq4gpAnc.html"

the site I visit has a few of those, I would only need everything in between the two periods:

vFIsdfuIHq4gpAnc

I would like to use my current format and coding that works around the regex environment. Please help me tune up my following preg match line:

preg_match_all("(./(.*?).html)", $sp, $content); 

Any kind of help I get on this is greatly appreciated and thank you in advance!

Here is my complete code

$dp = "http://www.cnn.com";

$sp = @file_get_contents($dp);
if ($sp === FALSE) {
    echo("<P>Error: unable to read the URL $dp.  Process aborted.</P>");
    exit();
}

preg_match_all("(./(.*?).html)", $sp, $content); 

foreach($content[1] as $surl) {
    $nctid = str_replace("mv/","",$surl);
    $nctid = str_replace("/","",$nctid);
   echo $nctid,'<br /><br /><br />';

the above is what I have been working on

Answer 1

It's pretty okay, really. It's just that you don't want to match .*?, you want to match multiple characters that aren't a full stop, so you can use [^.]+ instead.

$sp = 'a href="/mv/test-1-2-3-4.vFIsdfuIHq4gpAnc.html"';
preg_match_all( '/\.([^.]+).html/', $sp, $content );

var_dump( $content[1] );

The result that is printed:

array(1) {
  [0]=>
  string(16) "vFIsdfuIHq4gpAnc"
}

Here's an example of how to loop through all links:

<?php
$url = 'http://www.cnn.com';

$dom = new DomDocument( );
@$dom->loadHTMLFile( $url );

$links = $dom->getElementsByTagName( 'a' );

foreach( $links as $link ) {
    $href = $link->attributes->getNamedItem( 'href' );
    if( $href !== null ) {
        if( preg_match( '~mv/.*?([^.]+).html~', $href->nodeValue, $matches ) ) {
            echo "Link-id found: " . $matches[1] . "
";
        }
    }
}