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https://issues.apache.org/jira/browse/NIFI-1632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197492#comment-15197492
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Mark Payne commented on NIFI-1632:
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I attached a patch that is a unit test that exposes the issue. The attached
patch is not intended to resolve the issue.
> ExtractText throws NullPointerException if Regular Expression has optional
> Capturing Group that is not present
> --------------------------------------------------------------------------------------------------------------
>
> Key: NIFI-1632
> URL: https://issues.apache.org/jira/browse/NIFI-1632
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Mark Payne
> Fix For: 0.6.0
>
> Attachments:
> 0001-NIFI-1632-Generated-unit-test-to-prove-broken-behavi.patch
>
>
> If we use ExtractText and configure it with a regular expression that
> contains a Capturing Group that is "optional" (ends with a ?), and the regex
> matches some content where the capturing group is not present, then it will
> throw a NullPointerException
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