Filters
FilterX or classic filters, parsers, and rewrite rules?
FilterX replaces filters, parsers, and rewrite rules with a single typed language that can also handle nested JSON and other complex data. You don’t have to migrate: the classic blocks keep working, and you can use both in the same log path. To convert your existing configuration, see Update filters to FilterX.
The following sections describe how to select and filter log messages.
- Using filters describes how to configure and use filters.
- Combining filters with boolean operators shows how to create complex filters using boolean operators.
- Comparing macro values in filters explains how to evaluate macros in filters.
- Using wildcards, special characters, and regular expressions in filters provides tips on using regular expressions.
- Tagging messages explains how to tag messages and how to filter on the tags.
- Filter functions is a detailed description of the filter functions available in AxoSyslog.
Last modified October 1, 2026: Move filterx chapter higher and link it from classical pages (4a7e94c3)