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https://issues.apache.org/jira/browse/MINIFICPP-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292667#comment-16292667
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ASF GitHub Bot commented on MINIFICPP-330:
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Github user achristianson commented on the issue:
https://github.com/apache/nifi-minifi-cpp/pull/219
@phrocker yes, if they call substringBefore on an attr with no other
arguments, then they should get an "attempted to call incomplete function."
I'll add a test case for that.
> Implement substring operations in Expression Language
> -----------------------------------------------------
>
> Key: MINIFICPP-330
> URL: https://issues.apache.org/jira/browse/MINIFICPP-330
> Project: NiFi MiNiFi C++
> Issue Type: Improvement
> Reporter: Andrew Christianson
> Assignee: Andrew Christianson
>
> Add support for these substring functions to EL:
> substring
> substringBefore
> substringBeforeLast
> substringAfter
> substringAfterLast
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