Hi, Thanks for you information, i manage to do this with: filter f_host { match( 'original_source=[^\.]*' flags(store-matches) value('MSGONLY') type("pcre") ); }; destination d_host { file("/data/$1/messages.log") }; If it can help someone else. Maybe a last question could be if it is not better to use glob in this case to reduce cpu usage ? But i didn't manage to do it with different try like : filter f_host { match( "original_source=*.example.com" flags(store-matches) value('MSGONLY') type("glob") ); }; ---- On Tue, 24 Mar 2020 07:18:37 +0100 Balazs Scheidler <mailto:bazsi77@gmail.com> wrote ---- Hi, You can extract values from $MSG by using regexps (by using a regexp based filter with the flags(store-matches) option), or by using csv-parser() with a custom separator (this should be faster) or even db-parser. In any case, once you extracted the server name just make sure to store it in $HOST and then you can use $HOST in your destination filename. On Mon, Mar 23, 2020 at 7:16 PM Syslogng <mailto:syslogng@master666.com> wrote: -- Bazsi ______________________________________________________________________________ Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng Documentation: http://www.balabit.com/support/documentation/?product=syslog-ng FAQ: http://www.balabit.com/wiki/syslog-ng-faq Hi, We receive aggregated syslog from a server (all logs are send from 1 IP). Also all the events are mixed. The name of the host sending the initial traffic is in each event. ex: 2020/03/23 [notice] [user] New original_source=http://SERV1.example.com Task=0 .... How to recover SER1 which is always preceded by "original_source=" and followed by "http://example.com" to save it in a file for example /data/serv1.log I don't want a static filter (I know how to do it) but a dynamic one. If a new event arrives at original_source=http://SERV2.example.com I would like it to automatically create a /data/serv2.log Could you help me please ? thank you in advance Pit ______________________________________________________________________________ Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng Documentation: http://www.balabit.com/support/documentation/?product=syslog-ng FAQ: http://www.balabit.com/wiki/syslog-ng-faq