Grep

The Grep Filter plugin allows to match or exclude specific records based in regular expression patterns.

Configuration Parameters

The plugin supports the following configuration parameters:

Getting Started

In order to start filtering records, you can run the filter from the command line or through the configuration file. The following example assumes that you have a file called lines.txt with the following content

aaa
aab
bbb
ccc
ddd
eee
fff
ggg

Command Line

Note: using the command line mode need special attention to quote the regular expressions properly. It's suggested to use a configuration file.

The following command will load the tail plugin and read the content of lines.txt file. Then the grep filter will apply a regular expression rule over the log field (created by tail plugin) and only pass the records which field value starts with aa:

$ bin/fluent-bit -i tail -p 'path=lines.txt' -F grep -p 'regex=log aa' -m '*' -o stdout

Configuration File

[INPUT]
    Name   tail
    Path   lines.txt

[FILTER]
    Name   grep
    Match  *
    Regex  log aa

[OUTPUT]
    Name   stdout
    Match  *

The filter allows to use multiple rules which are applied in order, you can have many Regex and Exclude entries as required.