$regexp = "/@\{(?:([^\}]+?); )?([^\} ]+)\}/";
$s = preg_replace_callback($regexp, ['self', 'diasporaMention2BBCodeCallback'], $s);
$s = str_replace('#', '#', $s);
$regexp = "/@\{(?:([^\}]+?); )?([^\} ]+)\}/";
$s = preg_replace_callback($regexp, ['self', 'diasporaMention2BBCodeCallback'], $s);
$s = str_replace('#', '#', $s);