How to get an element's value from CURL'ed page

Assume there is a file abc.php which gets the content of page aaaa.html using curl. So that the content of aaaa.html are now in $data in abc.php.

What i want is that, there is an element in aaaa.html which is

I want the value 32 to be stored in another variable $number.

I know it can be done with regular expressions, i don't know the code for that.

 

<?php
preg_match('/name="jk" value="([0-9]+)"/', $data, $number);
echo $number;
?>

PHP: