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https://issues.apache.org/jira/browse/NIFI-4407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16545627#comment-16545627
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Mark Payne commented on NIFI-4407:
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I reviewed the documentation in the Expression Language Guide, and
unfortunately it doesn't really call out when $$ will be escaped and when it
won't. So I started by updating the Expression Language Guide to explain
exactly when the $$ will and won't be escaped. I then updated unit tests to
include the examples that I added to the EL Guide and to include the
${literal('SNAP$$$$$$$$$')} type examples provided by [~Absolutesantaja]
(thanks!). I then updated the code to ensure that all unit tests pass. PR is
now ready to be reviewed.
> Non-EL statement processed as expression language
> -------------------------------------------------
>
> Key: NIFI-4407
> URL: https://issues.apache.org/jira/browse/NIFI-4407
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.0.0, 1.1.0, 1.2.0, 1.1.1, 1.0.1, 1.3.0
> Reporter: Pierre Villard
> Priority: Critical
> Fix For: 1.8.0
>
>
> If you take a GFF with custom text: {{test$$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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