Module grok
Source - BASE10NUM
(?<![0-9.+-])(?>[+-]?(?:(?:[0-9]+(?:\.[0-9]+)?)|(?:\.[0-9]+)))- BASE16FLOAT
\b(?<![0-9A-Fa-f.])(?:[+-]?(?:0x)?(?:(?:[0-9A-Fa-f]+(?:\.[0-9A-Fa-f]*)?)|(?:\.[0-9A-Fa-f]+)))\b- BASE16NUM
(?<![0-9A-Fa-f])(?:[+-]?(?:0x)?(?:[0-9A-Fa-f]+))- CISCOMAC
(?:(?:[A-Fa-f0-9]{4}\.){2}[A-Fa-f0-9]{4})- COMMONMAC
(?:(?:[A-Fa-f0-9]{2}:){5}[A-Fa-f0-9]{2})- DATA
.*?- DATE
%{DATE_US}|%{DATE_EU}- DATESTAMP
%{DATE}[- ]%{TIME}- DATESTAMP_EVENTLOG
%{YEAR}%{MONTHNUM2}%{MONTHDAY}%{HOUR}%{MINUTE}%{SECOND}- DATESTAMP_OTHER
%{DAY} %{MONTH} %{MONTHDAY} %{TIME} %{TZ} %{YEAR}- DATESTAMP_RFC822
%{DAY} %{MONTH} %{MONTHDAY} %{YEAR} %{TIME} %{TZ}- DATESTAMP_RFC2822
%{DAY}, %{MONTHDAY} %{MONTH} %{YEAR} %{TIME} %{ISO8601_TIMEZONE}- DATE_EU
%{MONTHDAY}[./-]%{MONTHNUM}[./-]%{YEAR}- DATE_US
%{MONTHNUM}[/-]%{MONTHDAY}[/-]%{YEAR}- DAY
(?:Mon(?:day)?|Tue(?:sday)?|Wed(?:nesday)?|Thu(?:rsday)?|Fri(?:day)?|Sat(?:urday)?|Sun(?:day)?)- EMAILADDRESS
%{EMAILLOCALPART}@%{HOSTNAME}- EMAILLOCALPART
[a-zA-Z][a-zA-Z0-9_.+-=:]+- GREEDYDATA
.*- HOSTNAME
\b(?:[0-9A-Za-z][0-9A-Za-z-]{0,62})(?:\.(?:[0-9A-Za-z][0-9A-Za-z-]{0,62}))*(\.?|\b)- HOSTPORT
%{IPORHOST}:%{POSINT}- HOUR
(?:2[0123]|[01]?[0-9])- HTTPDATE
%{MONTHDAY}/%{MONTH}/%{YEAR}:%{TIME} %{INT}- INT
(?:[+-]?(?:[0-9]+))- IP
(?:%{IPV6}|%{IPV4})- IPORHOST
(?:%{IP}|%{HOSTNAME})- IPV4
(?<![0-9])(?:(?:[0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])[.](?:[0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])[.](?:[0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])[.](?:[0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5]))(?![0-9])- IPV6
((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?- ISO8601_SECOND
(?:%{SECOND}|60)- ISO8601_TIMEZONE
(?:Z|[+-]%{HOUR}(?::?%{MINUTE}))- LOGLEVEL
([Aa]lert|ALERT|[Tt]race|TRACE|[Dd]ebug|DEBUG|[Nn]otice|NOTICE|[Ii]nfo|INFO|[Ww]arn?(?:ing)?|WARN?(?:ING)?|[Ee]rr?(?:or)?|ERR?(?:OR)?|[Cc]rit?(?:ical)?|CRIT?(?:ICAL)?|[Ff]atal|FATAL|[Ss]evere|SEVERE|EMERG(?:ENCY)?|[Ee]merg(?:ency)?)- MAC
(?:%{CISCOMAC}|%{WINDOWSMAC}|%{COMMONMAC})- MINUTE
(?:[0-5][0-9])- MONTH
\b(?:[Jj]an(?:uary|uar)?|[Ff]eb(?:ruary|ruar)?|[Mm](?:a|ä)?r(?:ch|z)?|[Aa]pr(?:il)?|[Mm]a(?:y|i)?|[Jj]un(?:e|i)?|[Jj]ul(?:y)?|[Aa]ug(?:ust)?|[Ss]ep(?:tember)?|[Oo](?:c|k)?t(?:ober)?|[Nn]ov(?:ember)?|[Dd]e(?:c|z)(?:ember)?)\b- MONTHDAY
(?:(?:0[1-9])|(?:[12][0-9])|(?:3[01])|[1-9])- MONTHNUM
(?:0?[1-9]|1[0-2])- MONTHNUM2
(?:0[1-9]|1[0-2])- NONNEGINT
\b(?:[0-9]+)\b- NOTSPACE
\S+- NUMBER
(?:%{BASE10NUM})- PATH
(?:%{UNIXPATH}|%{WINPATH})- POSINT
\b(?:[1-9][0-9]*)\b- PROG
[\x21-\x5a\x5c\x5e-\x7e]+- QS
%{QUOTEDSTRING}- QUOTEDSTRING
(?>(?<!\\)(?>"(?>\\.|[^\\"]+)+"|""|(?>'(?>\\.|[^\\']+)+')|''|(?>(?>\.|[^\]+)+)|``))`- SECOND
(?:(?:[0-5]?[0-9]|60)(?:[:.,][0-9]+)?)- SPACE
\s*- SYSLOGBASE
%{SYSLOGTIMESTAMP:timestamp} (?:%{SYSLOGFACILITY} )?%{SYSLOGHOST:logsource} %{SYSLOGPROG}:- SYSLOGFACILITY
<%{NONNEGINT:facility}.%{NONNEGINT:priority}>- SYSLOGHOST
%{IPORHOST}- SYSLOGPROG
%{PROG:program}(?:\[%{POSINT:pid}\])?- SYSLOGTIMESTAMP
%{MONTH} +%{MONTHDAY} %{TIME}- TIME
(?!<[0-9])%{HOUR}:%{MINUTE}(?::%{SECOND})(?![0-9])- TIMESTAMP_ISO8601
%{YEAR}-%{MONTHNUM}-%{MONTHDAY}[T ]%{HOUR}:?%{MINUTE}(?::?%{SECOND})?%{ISO8601_TIMEZONE}?- TTY
(?:/dev/(pts|tty([pq])?)(\w+)?/?(?:[0-9]+))- TZ
(?:[APMCE][SD]T|UTC)- UNIXPATH
(/[[[:alnum:]]_%!$@:\.,+~-]*)+- URI
%{URIPROTO}://(?:%{USER}(?::[^@]*)?@)?(?:%{URIHOST})?(?:%{URIPATHPARAM})?- URIHOST
%{IPORHOST}(?::%{POSINT:port})?- URIPARAM
\?[A-Za-z0-9$.+!*'|(){},~@#%&/=:;_?\-\[\]<>]*- URIPATH
(?:/[A-Za-z0-9$.+!*'(){},~:;=@#%&_\-]*)+- URIPATHPARAM
%{URIPATH}(?:%{URIPARAM})?- URIPROTO
[A-Za-z]([A-Za-z0-9+\-.]+)+- URN
urn:[0-9A-Za-z][0-9A-Za-z-]{0,31}:(?:%[0-9a-fA-F]{2}|[0-9A-Za-z()+,.:=@;$_!*'/?#-])+- USER
%{USERNAME}- USERNAME
[a-zA-Z0-9._-]+- UUID
[A-Fa-f0-9]{8}-(?:[A-Fa-f0-9]{4}-){3}[A-Fa-f0-9]{12}- WINDOWSMAC
(?:(?:[A-Fa-f0-9]{2}-){5}[A-Fa-f0-9]{2})- WINPATH
(?>[A-Za-z]+:|\\)(?:\\[^\\?*]*)+- WORD
\b\w+\b- YEAR
(?>\d\d){1,2}