Based on this comment: https://tt-rss.org/oldforum/viewtopic.php?p=18518&sid=cd24b02164d5690e0384795fc4a36c44#p18518 I updated the regex so it works with newer tt-rss versions and ported to nginx. tested on tt-rss18.8, behind nginx
edit config.php in tt-rss dir change the following line , so the parameter value is empty:
define('LOG_DESTINATION', '');