如何使用php正则表达式进行描述？

Question

Iam making a webcrawler and I need to extract the metadata that contains the description, this is what I did:

$html = file_get_contents('http://www.google.com');
preg_match('/<meta name="description" content="(.*)"/>\i', $html, $description);
$description_out = $description;
var_dump($description_out);

and I get this error

Warning: preg_match(): Unknown modifier '>' in C:\xampp\htdocs\webcrawler\php-web-crawler\index.php on line 21

What is the correct regular expression?

Answer 1

Your pattern is incorrect. You start with a / delimiter and then you have an unescaped / in the pattern this ends the pattern and everything after it is read as modifiers.
Then your end delimiter was on the wrong way, was \ should be /.

'/<meta name="description" content="(.*)"\/>/i',