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https://issues.apache.org/jira/browse/NIFI-911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14723865#comment-14723865
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Mark Payne commented on NIFI-911:
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[~mcgilman] - Looks good. Behaves as expected. Unit tests pass, compiles &
passes contrib-check. +1
> ReplaceText, with default configuration, will cause the replacement to be
> added twice
> -------------------------------------------------------------------------------------
>
> Key: NIFI-911
> URL: https://issues.apache.org/jira/browse/NIFI-911
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Mark Payne
> Assignee: Matt Gilman
> Labels: beginner, newbie
> Fix For: 0.3.0
>
> Attachments: 0001-NIFI-911.patch
>
>
> Currently, the default value for the Regular Expression property is (.\*)
> which is intended to match any text. However, due to the way that the regular
> expression is interpreted, it first matches the entire content of the
> FlowFile and then again matches 0 characters at the end of the content
> (because .* will match 0 or more characters of any character).
> This results in the replacement value being added to the FlowFile twice. For
> example, if the replacement value is "Hello World", the output FlowFile will
> contain the text "Hello WorldHello World".
> We should instead change the regex pattern to (^.*$) to in order to ensure
> that we do not duplicate the output
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