127.0.0.1 - - [26/Mar/2016:19:09:19 -0400] "GET / HTTP/1.1" 401 194 "" "Mozilla/5.0 Gecko" "-"
%{IPORHOST:clientip} (?:-|(%{WORD}.%{WORD})) %{USER:ident} \[%{HTTPDATE:timestamp}\] "(?:%{WORD:verb} %{NOTSPACE:request}(?: HTTP/%{NUMBER:httpversion})?|%{DATA:rawrequest})" %{NUMBER:response} (?:%{NUMBER:bytes}|-) %{QS:referrer} %{QS:agent} %{QS:forwarder}