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https://issues.apache.org/jira/browse/NIFI-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15310294#comment-15310294
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ASF GitHub Bot commented on NIFI-1919:
--------------------------------------
Github user mattyb149 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/474#discussion_r65358298
--- Diff:
nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/evaluation/functions/ReplaceEvaluator.java
---
@@ -17,7 +17,6 @@
package org.apache.nifi.attribute.expression.language.evaluation.functions;
import java.util.Map;
-
--- End diff --
nit pick for unnecessary whitespace change with no other changes in the file
> Expression Language only evaluates regular expression replacement on
> replaceAll, not replace
> --------------------------------------------------------------------------------------------
>
> Key: NIFI-1919
> URL: https://issues.apache.org/jira/browse/NIFI-1919
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 0.6.1
> Reporter: Andy LoPresto
> Assignee: Andy LoPresto
> Fix For: 1.0.0, 0.7.0
>
>
> When {{${attribute:replaceAll('\w+', 'replacement')}}} is called, the pattern
> is matched and applied. However, when {{${attribute:replace('\w+',
> 'replacement')}}} is called, it is not. I believe this is because
> {{ReplaceAllEvaluator}} uses {{String#replaceAll(String regex, String
> replacement)}} while {{ReplaceEvaluator}} uses {{String#replace(CharSequence
> target, CharSequence replacement)}} which then uses
> {{Pattern.compile(target.toString(), Pattern.LITERAL)}} instead of compiling
> for a regular expression. I am writing a unit test to demonstrate this and
> show the results when {{String#replaceFirst()}} is used instead.
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