$re = '/.*result..([^\}]+\})/m';
$str = '{"result":{"balance":9999,"created":"22/03/2022 22:23:31","last_login":1648876825,"stake_bli":110.0,"stake_date":1650240000,"username":"username","verified":"maybe"},"server":"bla","success":true}';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php