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https://issues.apache.org/jira/browse/FLINK-6905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dian Fu resolved FLINK-6905.
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Resolution: Not A Problem
Just found that this can be implemented with oneOrMore().optional().
> Support for zeroOrMore to CEP's pattern API
> -------------------------------------------
>
> Key: FLINK-6905
> URL: https://issues.apache.org/jira/browse/FLINK-6905
> Project: Flink
> Issue Type: Bug
> Components: CEP
> Reporter: Dian Fu
>
> Currently the quantifier has supported oneOrMore, times(int times), one()，we
> should also support API such as zeroOrMore.
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