preg_match pattern to scan these prices

i'm trying to scan prices from THIS page, i want to use this preg_match to extract prices from this div: <span class="price"><b>519,00 €</b></span>. What is the correct preg_match?

This is my extractor script:

<?php
echo  "funziona!";

    if(!$fp = fopen("https://www.google.it/webhp?sourceid=chrome-instant&ion=1&espv=2&es_th=1&ie=UTF-8#tbs=vw:l,mr:1&tbm=shop&q=samsung+galaxy+note+4&tbas=0" ,"r" )) {
        return false;
    } //our fopen is right, so let's go
    $content = "";

    while(!feof($fp)) { //while it is not the last line, we will add the current line to our $content
        $content .= fgets($fp, 1024);
    }
    fclose($fp); //we are done here, don't need the main source anymore
?>

<?php
//our fopen, fgets here

//our magic regex here
preg_match_all('/<span class=\"price">(.*?)<\/span>/s',$content, $prices); //THIS IS PREG_MATCH 
    echo $prices[0][0]."<br />";
?>

I have never used preg_match before, i'm trying to adapt this script.
Thank you.

Solution

Have a look at this:

<?php
function getUrl($Url,$Options = array(),&$optOut = array())
{

    $CURL_DEFAULT_SETTINGS  = array
    (
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_AUTOREFERER => true,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_CONNECTTIMEOUT => 10,
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 10,
        CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8'
    );

    if (!($ch = curl_init($Url)))
        throw new Exception("Couldn't initialize cURL library",100);

    if (is_array($CURL_DEFAULT_SETTINGS) && count($CURL_DEFAULT_SETTINGS) > 0)
        curl_setopt_array($ch,$CURL_DEFAULT_SETTINGS);

    if (is_array($Options) && count($Options) > 0)
    {
        foreach ($Options as $k => $v)
        {
            curl_setopt($ch,$k,$v);
        }
    }

    $Data = curl_exec($ch);
    $Error = curl_error($ch);

    $optOut['CURLINFO_HEADER_OUT'] = curl_getinfo($ch, CURLINFO_HEADER_OUT );

    curl_close($ch);

    if (!$Data)
    {
        if ($Error)
            throw new Exception($Error);

        return false;
    }

    return $Data;
}

function getPriceFor($query) {
    $data = getUrl('https://www.google.it/search?tbs=vw:l,mr:1&tbm=shop&q='.rawurlencode($query).'&tbas=0&bav=on.2,or.&cad=b&fp=6a24b60e09fe0b18&biw=1196&bih=703&dpr=2&ion=1&espv=2&tch=1&ech=1&psi=byWgVee9A4TNeIXRgLAK.1436558704099.3');
    $data = '['.preg_replace('/\/\*""\*\//msi',',',preg_replace('/\/\*""\*\/[\s]*$/msi','',$data)).']';
    $data = json_decode($data,true);
    preg_match_all('/<div[\s]+class="_OA"><div><b>([^<]+)[\s]*<\/b><\/div><div>([^<]+)<\/div><\/div>/msi',$data[3]['d'],$res);

    $re = array();

    foreach ($res[1] as $k=>$r)
        $re[] = array('price'=>$r,'from'=>$res[2][$k]);

    return $re;
}

print_r(getPriceFor('samsung galaxy note 4'));

That must display something like this: