blahblahblah50006998blahblah~!blah&expires_in=0&user_id=1111111&email=hello@earth.planet (string)
parse_str('blahblahblah50006998blahblah~!blah&expires_in=0&user_id=1111111&email=hello@earth.planet', $output);
print_r($output);
<?php
$subject = 'blahblahblah50006998blahblah~!blah&expires_in=0&user_id=1111111&email=hello@earth.planet (String)';
if (preg_match('/(?P<blabla>[^&]+).*user_id=(?P<user_id>\d+).*email=(?P<email>.[^ ]+)/', $subject, $regs)) {
echo 'blabla=' . $regs['blabla'];
echo 'user_id=' . $regs['user_id'];
echo 'email=' . $regs['email'];
}
?>