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https://issues.apache.org/jira/browse/NIFI-4095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060041#comment-16060041
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ASF subversion and git services commented on NIFI-4095:
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Commit 253ea2e73bd271e82dcfd6c706f679ddad014101 in nifi's branch
refs/heads/master from [~alopresto]
[ https://git-wip-us.apache.org/repos/asf?p=nifi.git;h=253ea2e ]
NIFI-4095 Changed minimum capture group count in ExtractText from 1 to 0.
Added unit test and removed obsolete test.
Added custom validation to enforce capture group if "include capture group 0"
is false.
> ExtractText should not require a capture group in every regular expression
> --------------------------------------------------------------------------
>
> Key: NIFI-4095
> URL: https://issues.apache.org/jira/browse/NIFI-4095
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Affects Versions: 1.3.0
> Reporter: Andy LoPresto
> Assignee: Andy LoPresto
> Labels: extracttext, regular_expression, validation
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> The {{ExtractText}} processor currently validates every regular expression
> and requires that it contain "between 1 and 40 capture groups". This seems to
> be a design decision, as the values are hardcoded into the
> [validator|https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ExtractText.java#L262-L262],
> but there are valid regular expressions that do not need an explicit capture
> group (especially when the expression is small and the full expression is the
> desired match). This results in unnecessary duplicate matches ("some_attr"
> and "some_attr.1" being identical).
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