no..
codice:
$content = file_get_contents('my');

$regex_pattern = 'access_id: \'(.*?)\',';
preg_match_all($regex_pattern,$content,$matches);
echo $matches;
In questo file ci sono:
"data": [
{
"fd": "Link",
"access_id": "xxxxxx",

},
{

A me serve estrarer xxxxxx