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https://issues.apache.org/jira/browse/NIFI-2072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063392#comment-16063392
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Andre F de Miranda commented on NIFI-2072:
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[~jfrazee] [~pvillard] There is a workaround to this that is using ExtractGrok.
Grok support named captures (and their extraction into attributes) out of the
box, making a suitable alternative to the functionality requested here.
All you need to do is to paste a pure regex on the grok pattern and voila. You
get an attribute {{grok.captureName}} and with the captured value
Unless there are some edge cases where ExtractGrok won't be able to handle I
suggest this to be a won't fix?
> 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
>
> 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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