Using a regular expression to extract URLs from links in an HTML document

I need to capture all links in a given html.

Here is sample code:

<div class="infobar">
    ... some code goes here ...
    <a href="/link/some-text">link 1</a>
    <a href="/link/another-text">link 2</a>
    <a href="/link/blabla">link 3</a>
    <a href="/link/whassup">link 4</a>
    ... some code goes here ...
</div>

I 开发者_运维百科need to get all links inside div.infobar that starts with /link/

I tried this:

preg_match_all('#<div class="infobar">.*?(href="/link/(.*?)") .*?</div>#is', $raw, $x);

but it gives me the only first match.

Thanks for advices.

I would suggest using DOMDocument for this very purpose rather than using regex. Consider following simple code:

$content = '
<div class="infobar">
    <a href="/link/some-text">link 1</a>
    <a href="/link/another-text">link 2</a>
    <a href="/link/blabla">link 3</a>
    <a href="/link/whassup">link 4</a>
</div>';
$dom = new DOMDocument();
$dom->loadHTML($content);

// To hold all your links...
$links = array();

// Get all divs
$divs = $dom->getElementsByTagName("div");
foreach($divs as $div) {
  // Check the class attr of each div
  $cl = $div->getAttribute("class");
  if ($cl == "infobar") {
    // Find all hrefs and append it to our $links array
    $hrefs = $div->getElementsByTagName("a");
    foreach ($hrefs as $href)
       $links[] = $href->getAttribute("href");
  }
}
var_dump($links);

OUTPUT

array(4) {
  [0]=>
  string(15) "/link/some-text"
  [1]=>
  string(18) "/link/another-text"
  [2]=>
  string(12) "/link/blabla"
  [3]=>
  string(13) "/link/whassup"
}

Revising my previous answer. You'll need to do it in two steps:

//This first step grabs the contents of the div.
preg_match('#(?<=<div class="infobar">).*?(?=</div>)#is', $raw, $x);

//And here, we grab all of the links.
preg_match_all('#href="/link/(.*?)"#is', $x[0], $x);

http://simplehtmldom.sourceforge.net/ :

// Create DOM from URL or file
$html = file_get_html('http://www.google.com/');

// Find all links
foreach($html->find('a') as $element)
       echo $element->href . '<br>'; 

Try this (I added a +):

preg_match_all('#<div class="infobar">.*?(href="/link/(?:.*?)")+ .*?</div>#is', $raw, $x);