FAQ about the **pattern_definitions** option in grok

Hi all
Can give me more description of pattern_definitions option.
When I read it in the configuration of the pipeline logstash with filebeat module.
I do not yet understand its functionality in the configuration :frowning:

pattern_definitions => {
:frowning: :frowning: :frowning:

I'm not sure what is unclear. It allows you to define extra grok patterns that you can use in your grok expressions. Like a grok pattern file but inside your Logstash configuration file.

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