Need clarity - logstash 'filter' patterns

In the docs and various examples, I'm seeing if statements in Input section, like:

if [message] =~ /dovecot: (imap|pop3|managesieve)-login

Apart from [message], what other fields can if take? I don't have much understanding about this. Is any documentation available?


Basically you can put a reference to a field, or a value.

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