Matt Gilman created NIFI-3837:
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Summary: ReplaceText - Backreference escape issue in Regex Replace
mode when using EL
Key: NIFI-3837
URL: https://issues.apache.org/jira/browse/NIFI-3837
Project: Apache NiFi
Issue Type: Bug
Components: Extensions
Reporter: Matt Gilman
Priority: Minor
When using ReplaceText in Regex Replace mode, $'s may be incorrectly
interrupted as a backreference and escaped. Given input 'ma$tt' and the
following ReplaceText configuration:
Search Value - (?s)(^.*$)
Replacement Value - ${'$1'}
Character Set - UTF-8
Maximum Buffer Size - 1 MB
Replacement Strategy - Regex Replace
Evaluation Mode - Entire text
The resulting output is 'ma\$tt'
The issue appears to be that this regular expression is too general [1]. This
happens when the replacement string uses expression language. It appears as
though all backreferences will be escaped.
[1]
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#L500
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