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https://issues.apache.org/jira/browse/NIFI-4094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066946#comment-16066946
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Mika Borner commented on NIFI-4094:
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Can't be easily fixed as this happens in java.util.regex
http://www.docjar.com/html/api/java/util/regex/Matcher.java.html
778 if (ASCII.isLower(nextChar) ||
779 ASCII.isUpper(nextChar) ||
780 ASCII.isDigit(nextChar)) {
781 gsb.append(nextChar);
> GrokReader does not allow named capture groups with underscores in name
> -----------------------------------------------------------------------
>
> Key: NIFI-4094
> URL: https://issues.apache.org/jira/browse/NIFI-4094
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.3.0
> Reporter: Mika Borner
> Priority: Minor
>
> When writing a regular expression with a named capture group, underscore
> can't be used.
> Typically, underscore is a valid character for capture groups. As avro also
> supports underscores, and GrokReader is used to write into avro schemas, this
> should be fixed.
> Example of non-working regex:
> (?<my_namedcapturegroup>.*)
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