Looking for uses of preg_quote() in combination with # found a couple of places needing changes in order to continue working the same. Both being "double-conversions" that due the nature of the new preg_quote(), now escaping hashes (#), were not working anymore:

• backup/util/helper/restore_log_rule.class.php:249
• mod/lesson/pagetypes/shortanswer.php:106

This is about to fix those 2 cases, surely replacing both by a preg_quote() safe string like '%@@%@@%'.