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https://issues.apache.org/jira/browse/NIFI-5077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16476212#comment-16476212
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ASF GitHub Bot commented on NIFI-5077:
--------------------------------------
Github user pvillard31 commented on the issue:
https://github.com/apache/nifi/pull/2698
Thanks @ottobackwards, merging to master
> Grok support for Empty Captures
> -------------------------------
>
> Key: NIFI-5077
> URL: https://issues.apache.org/jira/browse/NIFI-5077
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.6.0
> Environment: CentOS 7
> Reporter: Ramon de Graaff
> Assignee: Otto Fowler
> Priority: Major
> Attachments: grok.xml
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Pattern matches but also attaches null values.
> grok-pattern:
> {{TEST %\{A}|%\{B}}}
> {{A %\{INT:test}}}
> {{B %\{INT:test}}}
> {{INT (?:[+-]?(?:[0-9]+))}}
> flowfile-content:
> {{1}}
> Flow file attributes after match:
> {{grok.A}}
> {{1}}
> {{grok.TEST}}
> {{1}}
> {{grok.test}}
> {{[1, null]}}
>
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