Recently I've had an issue where my users reported that they were having trouble saving wiki pages on my wiki. I investigated and found server error log messages that indicated attempts to save wiki articles were matching web application firewall filters in mod security 3 and were being blocked causing the server to return a 500 error. The log had a lot of "Execution error - PCRE limits exceeded" in it. This seems to be Dokuwiki-specific. I am running PHP 7.3 I will be able to post more information later such as the logs but I wanted to raise awareness of this issue and see if anyone else has run into this problem.