Obtendo isso no Fedora 28 (atualizado para mostrar mais linhas):
2018-08-29 16:19:58,135 fail2ban.jail [31014]: INFO Creating new jail 'urlscanners'
2018-08-29 16:19:58,135 fail2ban.jail [31014]: INFO Jail 'urlscanners' uses pyinotify {}
2018-08-29 16:19:58,150 fail2ban.jail [31014]: INFO Initiated 'pyinotify' backend
2018-08-29 16:19:58,153 fail2ban.filter [31014]: ERROR No failure-id group in '[[]client (?P<host>\S*)[]] (File does not exist): .*(w00tw00t|CFIDE|php|cgi-bin|htdocs\.7z|htdocs\.rar|htdocs\.zip|root\.7z|root\.rar|root\.zip|www\.7z|www\.rar|wwwroot\.7z)'
2018-08-29 16:19:58,154 fail2ban.transmitter [31014]: WARNING Command ['set', 'urlscanners', 'addfailregex', '[[]client (?P<host>\S*)[]] (File does not exist): .*(w00tw00t|CFIDE|php|cgi-bin|htdocs\.7z|htdocs\.rar|htdocs\.zip|root\.7z|root\.rar|root\.zip|www\.7z|www\.rar|wwwroot\.7z)'] has failed. Received RegexException("No failure-id group in '[[]client (?P<host>\S*)[]] (File does not exist): .*(w00tw00t|CFIDE|php|cgi-bin|htdocs\.7z|htdocs\.rar|htdocs\.zip|root\.7z|root\.rar|root\.zip|www\.7z|www\.rar|wwwroot\.7z)'",)
2018-08-29 16:19:58,154 fail2ban [31014]: ERROR NOK: ("No failure-id group in '[[]client (?P<host>\S*)[]] (File does not exist): .*(w00tw00t|CFIDE|php|cgi-bin|htdocs\.7z|htdocs\.rar|htdocs\.zip|root\.7z|root\.rar|root\.zip|www\.7z|www\.rar|wwwroot\.7z)'",)
2018-08-29 16:19:58,155 fail2ban.filter [31014]: INFO Added logfile: '/usr/local/etc/httpd/logs/error_log' (pos = 819643, hash = 01289652cb6817b4a991911956c7aa9a160eb60b)