RFC5424 logstash syslog pattern.

SYSLOG5424F5_NILVALUE \-
SYSLOG5424F5_NONZERO_DIGIT [1-9]
SYSLOG5424F5_DIGIT (?:0|%{SYSLOG5424F5_NONZERO_DIGIT})
SYSLOG5424F5_PRINTUSASCII [\u0021-\u007e]
SYSLOG5424F5_SP \u0020
SYSLOG5424F5_BOM \u00ef\u00bb\u00bf
SYSLOG5424F5_MSG_UTF8 %{SYSLOG5424F5_BOM}\p{Assigned}*
SYSLOG5424F5_MSG_ANY \p{ASCII}*
SYSLOG5424F5_MSG (?:%{SYSLOG5424F5_MSG_ANY}|%{SYSLOG5424F5_MSG_UTF8})
SYSLOG5424F5_SD_NAME %{SYSLOG5424F5_PRINTUSASCII}{1,32}?
SYSLOG5424F5_PARAM_VALUE \p{Assigned}*?
SYSLOG5424F5_PARAM_NAME %{SYSLOG5424F5_SD_NAME}
SYSLOG5424F5_SD_ID %{SYSLOG5424F5_SD_NAME}
SYSLOG5424F5_SD_PARAM %{SYSLOG5424F5_PARAM_NAME}=\"%{SYSLOG5424F5_PARAM_VALUE}\\
"
SYSLOG5424F5_SD_PARAMS (?:%{SYSLOG5424F5_SP}%{SYSLOG5424F5_SD_PARAM})*?
SYSLOG5424F5_SD_ELEMENT \[%{SYSLOG5424F5_SD_ID:syslog5424_sd_id}%{SYSLOG5424F5_\
SD_PARAMS:syslog5424_sd_params}\]
SYSLOG5424F5_STRUCTURED_DATA (%{SYSLOG5424F5_NILVALUE}|%{SYSLOG5424F5_SD_ELEMEN\
T})
SYSLOG5424F5_TIME_HOUR (?:[01][0-9]|2[0-3])
SYSLOG5424F5_TIME_MINUTE [0-5][0-9]
SYSLOG5424F5_TIME_SECOND [0-5][0-9]
SYSLOG5424F5_TIME_SECFRAC (?:\.%{SYSLOG5424F5_DIGIT}{1,6}|)
SYSLOG5424F5_TIME_NUMOFFSET (?:\+|\-)%{SYSLOG5424F5_TIME_HOUR:syslog5424_time_n\
umoffset_hour}:%{SYSLOG5424F5_TIME_MINUTE:syslog5424_time_numoffset_minute}
SYSLOG5424F5_TIME_OFFSET %{SYSLOG5424F5_TIME_NUMOFFSET:syslog5424_time_numoffse\
t}
SYSLOG5424F5_PARTIAL_TIME %{SYSLOG5424F5_TIME_HOUR:syslog5424_time_hour}:%{SYSL\
OG5424F5_TIME_MINUTE:syslog5424_time_minute}:%{SYSLOG5424F5_TIME_SECOND:syslog5\
424_time_second}%{SYSLOG5424F5_TIME_SECFRAC:syslog5424_time_secfrac}
SYSLOG5424F5_FULL_TIME %{SYSLOG5424F5_PARTIAL_TIME:syslog5424_partial_time}%{SY\
SLOG5424F5_TIME_OFFSET}
SYSLOG5424F5_DATE_MDAY (?:0[1-9]|[1-2][0-9]|3[01])
SYSLOG5424F5_DATE_MONTH (?:0[1-9]|1[0-2])
SYSLOG5424F5_DATE_FULLYEAR [0-9]{4}
SYSLOG5424F5_FULL_DATE %{SYSLOG5424F5_DATE_FULLYEAR:syslog5424_full_year}\-%{SY\
SLOG5424F5_DATE_MONTH:syslog5424_month}\-%{SYSLOG5424F5_DATE_MDAY:syslog5424_md\
ay}
SYSLOG5424F5_TIMESTAMP (?:%{SYSLOG5424F5_NILVALUE}|%{SYSLOG5424F5_FULL_DATE:sys\
log5424_full_date}T%{SYSLOG5424F5_FULL_TIME:syslog5424_full_time})
SYSLOG5424F5_MSG_ID (?:%{SYSLOG5424F5_NILVALUE}|%{SYSLOG5424F5_PRINTUSASCII}{1,\
32})
SYSLOG5424F5_PROC_ID (?:%{SYSLOG5424F5_NILVALUE}|%{SYSLOG5424F5_PRINTUSASCII}{1\
,12})
SYSLOG5424F5_APP_NAME (?:%{SYSLOG5424F5_NILVALUE}|%{SYSLOG5424F5_PRINTUSASCII}{\
1,48})
SYSLOG5424F5_HOSTNAME (?:%{SYSLOG5424F5_NILVALUE}|%{SYSLOG5424F5_PRINTUSASCII}{\
1,255})
SYSLOG5424F5_VERSION %{SYSLOG5424F5_NONZERO_DIGIT}%{SYSLOG5424F5_DIGIT}{0,2}
SYSLOG5424F5_PRIVAL (?:[0-9]|[0-9][0-9]|1[0-8][0-9]|19[0-1])
SYSLOG5424F5_PRI <%{SYSLOG5424F5_PRIVAL:syslog5424_prival}>
SYSLOG5424F5_HEADER %{SYSLOG5424F5_PRI}%{SYSLOG5424F5_VERSION:syslog5424_versio\
n}%{SYSLOG5424F5_SP}%{SYSLOG5424F5_TIMESTAMP:syslog5424_timestamp}%{SYSLOG5424F\
5_SP}%{SYSLOG5424F5_HOSTNAME:syslog5424_hostname}%{SYSLOG5424F5_SP}%{SYSLOG5424\
F5_APP_NAME:syslog5424_app_name}%{SYSLOG5424F5_SP}%{SYSLOG5424F5_PROC_ID:syslog\
5424_proc_id}%{SYSLOG5424F5_SP}%{SYSLOG5424F5_MSG_ID:syslog5424_msg_id}
SYSLOG5424F5_LINE %{SYSLOG5424F5_HEADER}%{SYSLOG5424F5_SP}%{SYSLOG5424F5_STRUCT\
URED_DATA}(?: |)%{SYSLOG5424F5_MSG:syslog5424_msg}