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https://issues.apache.org/jira/browse/NIFI-5813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17058930#comment-17058930
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Otto Fowler commented on NIFI-5813:
-----------------------------------
I believe this is the same issue as
https://issues.apache.org/jira/browse/NIFI-3303, namely the conflation of
escaping regex, json and expression language.
You can read that issue to see where it lies
> ReplaceText regression: fails on mixed literal dollar signs and backreferences
> ------------------------------------------------------------------------------
>
> Key: NIFI-5813
> URL: https://issues.apache.org/jira/browse/NIFI-5813
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.8.0
> Reporter: Konstantin
> Priority: Minor
> Labels: regexp_replace, regression
> Attachments: ReplaceText_regression.xml
>
>
> We've got a bug with ReplaceText when in replacement value are both the
> literal dollar signs and backreferences.
> Our use case is preparing Mongo queries using the value passed in FlowFile.
> The replacement looks like this:
> {code:java}
> {updatedTime: {$ne: $1}}
> {code}
> NiFi 1.7.1 iterates through this line
> ([source|https://github.com/apache/nifi/blob/rel/nifi-1.7.1/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ReplaceText.java#L709])
> and correctly replaces only "$ne", leaving "$1" untouched. NiFi 1.8.0, on
> the other hand, uses Matcher
> ([source|https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ReplaceText.java#L717]),
> which escapes all and every dollar sign if it ever finds the need to escape
> one, so the backreference is treated as literal replacement, and the query
> fails.
> We have to make a workaround right now by using several ReplaceText
> processors in a row, but this looks rather ugly. Hoping to see this fixed.
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