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https://issues.apache.org/jira/browse/FLINK-3318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417947#comment-15417947
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ASF GitHub Bot commented on FLINK-3318:
---------------------------------------
GitHub user mushketyk opened a pull request:
https://github.com/apache/flink/pull/2361
[FLINK-3318][cep] Add support for quantifiers to CEP's pattern API
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please take the following check list into consideration.
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You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mushketyk/flink cep-operators
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2361.patch
To close this pull request, make a commit to your master/trunk branch
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This closes #2361
----
commit 96c077a4c1c2c1ccba678ec863775402554d6dcf
Author: Ivan Mushketyk <[email protected]>
Date: 2016-08-05T20:05:39Z
[FLINK-3318][cep] Add support for quantifiers to CEP's pattern API
commit 425fa3d94d15ea6b1396e7bf7a901f7318f107b0
Author: Ivan Mushketyk <[email protected]>
Date: 2016-08-11T21:10:43Z
[FLINK-3318][cep] Add documentation about pattern quantifiers
----
> Add support for quantifiers to CEP's pattern API
> ------------------------------------------------
>
> Key: FLINK-3318
> URL: https://issues.apache.org/jira/browse/FLINK-3318
> Project: Flink
> Issue Type: Improvement
> Components: CEP
> Affects Versions: 1.0.0
> Reporter: Till Rohrmann
> Assignee: Ivan Mushketyk
> Priority: Minor
>
> It would be a good addition to extend the pattern API to support quantifiers
> known from regular expressions (e.g. Kleene star, ?, +, or count bounds).
> This would considerably enrich the set of supported patterns.
> Implementing the count bounds could be done by unrolling the pattern state.
> In order to support the Kleene star operator, the {{NFACompiler}} has to be
> extended to insert epsilon-transition between a Kleene start state and the
> succeeding pattern state. In order to support {{?}}, one could insert two
> paths from the preceding state, one which accepts the event and another which
> directly goes into the next pattern state.
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