Question

let me know I can use that expression to extract the url in the following code

<div class="bg-movie alpha omega">
<img class="alignnone size-full wp-image-7282" 
         title="CineMundo Tu Mejor Lugar El Caballero de la Noche Asciende" 
         src="http://www.cinemundo.cl/sitio/wp-content/uploads/2012/05/cinemundo_batman_el-caballero-de-la-noche-asciende_estrenos-2012.jpg" 
         alt="Película El Caballero de la Noche Asciende - Estrenos 2012" 
         width="117" height="173">
</div> 

and come to this but I do not work well

preg_match_all('/<img [class="bg-movie alpha omega"]*src=["|\']([^"|\']+)/i', $html, $images);

Answer 1

Rather than trying to force regular expressions do deal with all the weird edge cases when parsing HTML, you could just use PHP’s built-in DOM library for parsing the HTML and getting the data you need:

<?php

$doc = new DOMDocument();

$data = <<<EOD
<div class="bg-movie alpha omega">
<img class="alignnone size-full wp-image-7282"
         title="CineMundo Tu Mejor Lugar El Caballero de la Noche Asciende"
         src="http://www.cinemundo.cl/sitio/wp-content/uploads/2012/05/cinemundo_batman_el-caballero-de-la-noche-asciende_estrenos-2012.jpg"
         alt="Película El Caballero de la Noche Asciende - Estrenos 2012"
         width="117" height="173">
</div>
EOD;

$doc->loadHTML($data);
$xpath = new DOMXpath($doc);
$result = $xpath->query('//img/@src');

foreach ($result as $srcAttr) {
    echo $srcAttr->value, "\n";
}

EDIT: Here is an example loading a page from the website:

<?php

$doc = new DOMDocument();
$url='http://www.cinemundo.cl/peliculas/batman-el-caballero-de-la-noche-asciende/';
@$doc->loadHTMLFile($url);
$xpath = new DOMXpath($doc);
$result = $xpath->query('//div[@class="bg-movie alpha omega"]/img/@src');

foreach ($result as $srcAttr) {
    echo $srcAttr->value, "\n";
}