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https://issues.apache.org/jira/browse/FLINK-3320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15340176#comment-15340176
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Robert Thorman commented on FLINK-3320:
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Seems like the same situation as the OR operator. I this is as simple as
adding these methods like the AND, I'd be glad to work on this.
> Add not operator to CEP's pattern API
> -------------------------------------
>
> Key: FLINK-3320
> URL: https://issues.apache.org/jira/browse/FLINK-3320
> Project: Flink
> Issue Type: Improvement
> Components: CEP
> Affects Versions: 1.0.0
> Reporter: Till Rohrmann
> Priority: Minor
>
> Currently, CEP's pattern API is lacking a {{not}} operator which would you
> allow to define which events must not occur in a matched pattern. It would be
> beneficial to add this operator in order to increase the set of supported
> patterns.
> {code}
> Pattern.begin("start").where(...).followedBy("middle").notFollowedBy("not").where(...).notNext("not2").where(...)
> {code}
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