[jira] [Resolved] (NIFI-4095) ExtractText should not require a capture group in every regular expression

["Pierre Villard (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-4095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pierre Villard resolved NIFI-4095.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.4.0

> 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
>             Fix For: 1.4.0
>
>   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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