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https://issues.apache.org/jira/browse/TEXT-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16662917#comment-16662917
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Gary Gregory commented on TEXT-127:
-----------------------------------
The best path is to submit a PR on GitHub IMO. I would make sure the current
behavior is not broken, IOW, don't throw an exception unless I call an API to
enable it. Don't forget unit tests ;-)
> Detect when a variable is unknown in StringSubstitutor
> ------------------------------------------------------
>
> Key: TEXT-127
> URL: https://issues.apache.org/jira/browse/TEXT-127
> Project: Commons Text
> Issue Type: Improvement
> Reporter: Jean-Baptiste REICH
> Priority: Minor
>
> Currently, StringSubstitutor is not replacing a variable that is unknown. It
> would be nice to define the behavior in this case and to allow raising an
> exception.
> A workaround is to define a custom StringLookup that raises an exception when
> the variable is unknown but this prevent from using the default value feature
> from StringSubstitutor
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