Accordig to rcf5424 IP address should be accepted

Fixes #184

Author: flysen

patterns/linux-syslog

@@ -11,6 +11,6 @@ SYSLOGLINE %{SYSLOGBASE2} %{GREEDYDATA:message}
 # IETF 5424 syslog(8) format (see http://www.rfc-editor.org/info/rfc5424)
 SYSLOG5424PRI <%{NONNEGINT:syslog5424_pri}>
 SYSLOG5424SD \[%{DATA}\]+
-SYSLOG5424BASE %{SYSLOG5424PRI}%{NONNEGINT:syslog5424_ver} +(?:%{TIMESTAMP_ISO8601:syslog5424_ts}|-) +(?:%{HOSTNAME:syslog5424_host}|-) +(-|%{SYSLOG5424PRINTASCII:syslog5424_app}) +(-|%{SYSLOG5424PRINTASCII:syslog5424_proc}) +(-|%{SYSLOG5424PRINTASCII:syslog5424_msgid}) +(?:%{SYSLOG5424SD:syslog5424_sd}|-|)
+SYSLOG5424BASE %{SYSLOG5424PRI}%{NONNEGINT:syslog5424_ver} +(?:%{TIMESTAMP_ISO8601:syslog5424_ts}|-) +(?:%{IPORHOST:syslog5424_host}|-) +(-|%{SYSLOG5424PRINTASCII:syslog5424_app}) +(-|%{SYSLOG5424PRINTASCII:syslog5424_proc}) +(-|%{SYSLOG5424PRINTASCII:syslog5424_msgid}) +(?:%{SYSLOG5424SD:syslog5424_sd}|-|)
 
 SYSLOG5424LINE %{SYSLOG5424BASE} +%{GREEDYDATA:syslog5424_msg}