用于提取元数据的正则表达式

I have retrieved html page using cURL, now I want to extract the specific meta content from the meta data. i.e. <meta name="ids" content="123nsdfsdfAS">.

What I did as follows:

function file_get_contents_curl($url)
{
$agent= 'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0';

$ch = curl_init();

curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);

$data = curl_exec($ch);
curl_close($ch);

return $data;
}

$html = file_get_contents_curl("http://example.com");

So, I want to extract a specific meta content i.e. <meta name="ids" content="123nsdfsdfAS"> from $html using preg_match_all or preg_match or related any function and regular expression. I have written a regex but that is not good, so I did not mention here.

Well, here it's fairly easy:

/<meta[^>]+>/

will match any meta tag.

/<meta name="ids"[^>]+>/

will match only the meta tag with the name ids.

If you only want the content in this

/<meta name="ids" content="([^"]+)">/

try this <meta name="ids"(.*?)>. easy way... $1 will give you the attributes

Below regex match meta element

<meta(?: [^>]+)?>

ex:
<meta>
<meta id="12"> any attribute

<meta(?: [^>]+)? id="([^"]*)"[^>]*>

ex:
<meta id="123">
<meta id="123" content="cnt">