Not much to go on with that question.
Sounds like you have a message coming into a stream and you want to know how to break it into fields with either extractors or in the pipeline (they both do pretty much the same thing).
Could you explain a little bit further on what you have, what you are looking for… include an example message and extractor/pipeline information?
There is a bunch more side information that you can post that is relevant… use this post as a guide… there is also this post that includes some commands for extracting environmental information…