Mark Payne created NIFI-911:
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Summary: 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
Fix For: 0.3.0
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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