What is Logstash regex engine?


Just came across some regex in config files today and i cannot figure out which engine it is based on and documentation about the syntax i should use in my config.

the thing i've stumbled across :

if [field] !~  /.+\.dll/

grok is built upon Oniguruma, but I think the rest of logstash uses standard Ruby expressions.

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Thanks for you fast reply as usual :wink:

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