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https://issues.apache.org/jira/browse/NIFI-9490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17464581#comment-17464581
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Ahmed Shaaban M. Abd El Megeed commented on NIFI-9490:
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Hi Mark,
I am a bit confused. The replacement value already supports expression
language. If we take one of the examples you provided, ${'$1':toUpper()} give
the same intended result of making the line upper case.
> Add a 'Use Expression Language' Replacement Strategy to ReplaceText
> -------------------------------------------------------------------
>
> Key: NIFI-9490
> URL: https://issues.apache.org/jira/browse/NIFI-9490
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Mark Payne
> Priority: Major
>
> When we have data that requires multiple transformations, the typical
> solution is to chain together multiple instances of ReplaceText. But this is
> expensive. It has to read & write the content multiple times. We also have to
> use Regex and are limited in the types of transformations that we can perform.
> We should add a new Replacement Strategy of "Use Expression Language." When
> selected, the Search Value should be ignored (and should be hidden via
> dependent properties). The Replacement Value should allow for Expression
> Language and should be provided FlowFile attributes as well as a variable
> named text that is to be evaluated. If the Evaluate Mode is Line-by-Line, it
> should also be provided a variable named lineNo that indicates the 1-based
> line number that is being evaluated.
> This allows for powerful transformations, such as:
> {\{ ${text:toUpper()} }} to make the line uppercase
> {\{ ${lineNo}: ${text} }} to prepend each line of text with a line number
> followed by a colon
> And many other possibilities that are not easily available today.
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