findWithPrefix example

$account = $node->getOwner() ? $node->getOwner() : User::load(0);
          $replacements[$original] = $account->label();
          $bubbleable_metadata->addCacheableDependency($account);
          break;

        case 'created':
          $replacements[$original] = \Drupal::service('date.formatter')->format($node->getCreatedTime(), 'medium', '', NULL, $langcode);
          break;
      }
    }

    if ($author_tokens = $token_service->findWithPrefix($tokens, 'author')) {
      $replacements += $token_service->generate('user', $author_tokens, ['user' => $node->getOwner()], $options, $bubbleable_metadata);
    }

    if ($created_tokens = $token_service->findWithPrefix($tokens, 'created')) {
      $replacements += $token_service->generate('date', $created_tokens, ['date' => $node->getCreatedTime()], $options, $bubbleable_metadata);
    }
  }

  return $replacements;
}