These are all described in the manual. Definitely would be good to start there - 

https://www.balabit.com/documents/syslog-ng-ose-latest-guides/en/syslog-ng-ose-guide-admin/html-single/

On Mon, Feb 20, 2017 at 6:19 AM, SivaRamaPrasad Ravipati <sivar@biarca.com> wrote:

Hi,

I have some queries. Please clarify me.

1) What are the different filter combinations used by syslog-ng and their unique usecases?

2)What languages are used to write filters?

3)How do we provide security while filtering logs?

Thanks,

Sivaram.

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Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng
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FAQ: http://www.balabit.com/wiki/syslog-ng-faq