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https://issues.apache.org/jira/browse/NIFI-2072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17152904#comment-17152904
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Malthe Borch commented on NIFI-2072:
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I would be happy then with "Enable named group support".

In terms of what happens if an unnamed capture group is used, I think it would 
be better to either:

- Allow it.
- Implement a validation step that scans the expression for unnamed capture 
groups (i.e. those that are not named and not non-capturing).

> Support named captures in ExtractText
> -------------------------------------
>
>                 Key: NIFI-2072
>                 URL: https://issues.apache.org/jira/browse/NIFI-2072
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Joey Frazee
>            Assignee: Otto Fowler
>            Priority: Major
>              Labels: extracttext
>
> ExtractText currently captures and creates attributes using numeric indices 
> (e.g, attribute.name.0, attribute.name.1, etc.) whether or not the capture 
> groups are named, i.e., patterns like (?<name>\w+).
> In addition to being more faithful to the provided regexes, named captures 
> could help simplify data flows because you wouldn't have to add superfluous 
> UpdateAttribute steps which are just renaming the indexed captures to more 
> interpretable names.



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