[
https://issues.apache.org/jira/browse/NIFI-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15301074#comment-15301074
]
Andy LoPresto commented on NIFI-1919:
-------------------------------------
The issue was originally posted in the mailing list [1] and after more
investigation [2] I think the solution is to add a new expression language
method called replaceFirst, which parallels Java's String#replaceFirst [3] and
accepts a regular expression pattern and replaces it only once. I will update
the unit tests to properly capture this, and will update the documentation to
reflect the new method.
[1]
http://apache-nifi-developer-list.39713.n7.nabble.com/Apache-NiFi-expression-language-td10610.html
[2]
http://apache-nifi-developer-list.39713.n7.nabble.com/discuss-Proposed-addition-of-replaceRegex-to-expression-language-td10713.html
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
