The following sections describe how to select and filter log messages.
Section 8.5.1, Using filters describes how to configure and use filters.
Section 8.5.2, Combining filters with boolean operators shows how to create complex filters using boolean operators.
Section 8.5.3, Comparing macro values in filters explains how to evaluate macros in filters.
Section 8.5.4, Using wildcards, special characters, and regular expressions in filters provides tips on using regular expressions.
Section 8.5.5, Tagging messages explains how to tag messages and how to filter on the tags.
Section 8.5.6, Filter functions is a detailed description of the filter functions available in syslog-ng PE.