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https://issues.apache.org/jira/browse/NIFI-4407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16175418#comment-16175418
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Pierre Villard commented on NIFI-4407:
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It seems to be the expected behaviour if we look at
{{org.apache.nifi.attribute.expression.language.TestQuery}}
Instead of a bug, it could be something to document in
https://nifi.apache.org/docs/nifi-docs/html/expression-language-guide.html
> Non-EL statement processed as expression language
> -------------------------------------------------
>
> Key: NIFI-4407
> URL: https://issues.apache.org/jira/browse/NIFI-4407
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.0.0, 1.1.0, 1.2.0, 1.1.1, 1.0.1, 1.3.0
> Reporter: Pierre Villard
> Priority: Critical
>
> If you take a GFF with custom text: {{test$$foo}}
> The generated text will be: {{test$foo}}
> The property supports expression language and one $ is removed during the EL
> evaluation step. This can be an issue if a user wants to use a value
> containing to consecutive $$ (such as in password fields).
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