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https://issues.apache.org/jira/browse/IO-579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16506120#comment-16506120
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Gary Gregory commented on IO-579:
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Hello [~ohadr],
Case-sensitivity for file names depends on the file system. The Javadoc for
this method specifies "The extension check is case-sensitive on all platforms."
There is nothing to fix in this API IMO.
> FilenameUtils.isExtension() is case-sensitive
> ---------------------------------------------
>
> Key: IO-579
> URL: https://issues.apache.org/jira/browse/IO-579
> Project: Commons IO
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.6
> Reporter: Ohad R
> Priority: Major
> Labels: easyfix
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> FilenameUtils.isExtension() is case-sensitive.
> All 3 implementations of this method call String.equals() rather than
> equalsIgnoreCase(), so it means that if my extension is "jpg", for example,
> and my filename is something.JPG, the method (any of them) will return
> 'false'.
>
> fix suggestion: should use the method
> [FilenameUtils.eqauls(...)|https://github.com/apache/commons-io/blob/master/src/main/java/org/apache/commons/io/FilenameUtils.java#L1200]
>
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