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https://issues.apache.org/jira/browse/ARCHETYPE-492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290895#comment-16290895
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Matthias Hanisch edited comment on ARCHETYPE-492 at 12/15/17 9:17 AM:
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Got the same problem today. Wanted to generate a file
{noformat}
errors_${artifactId}.properties
{noformat}
so I chose the filename
{noformat}
errors___artifactId__.properties
{noformat}

in the archetype.
The placeholder in the file name was not resolved.


was (Author: matze):
Got the same problem today. Wanted to generate a file 
errors_${artifactId}.properties, so I chose the filename 
errors____artifactId___.properties in the archetype.
The placeholder in the file name was not resolved.

> Underscore in filenames problematic due to greedy regex
> -------------------------------------------------------
>
>                 Key: ARCHETYPE-492
>                 URL: https://issues.apache.org/jira/browse/ARCHETYPE-492
>             Project: Maven Archetype
>          Issue Type: Bug
>          Components: Plugin
>    Affects Versions: 2.4
>         Environment: Windows 7, Sun JDK
>            Reporter: Oliver Dungey
>
> If you have a file in a project with an underscore adjacent to a substitution 
> variable, the substitution will fail i.e.
> if {{artifactId}} is 'Test' and a target file is to be named 
> {{something_test.txt}} the file in the template should be named 
> {{something____artifactId__.txt}} (3 underscores in the middle) but the 
> result is an error stating that the property {{_artifactId}} cannot be found. 
> This is because the term inside the regex is a greedy .*  - a simple fix 
> would be to change this to something like __[^_]*___  which would only match 
> non-underscore characters.
> Fixing this issue would allow the use of underscores in filenames in all 
> circumstances rather than the current situation where you may get lucky. The 
> only down side to fixing this issue is that properties with leading or 
> trailing underscores will not be valid - this seems a far more preferable 
> situation.
> A patch for this issue was put on this bug back in 01//2009 but somehow got 
> ignored - see [~maslovalex] patch and comments at the end of this issue: 
> https://issues.apache.org/jira/browse/ARCHETYPE-191
> Apologies for the formatting - it appears double underscores are an issue :-)



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