Peter De Maeyer created IO-886:
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Summary: PathUtils.RelativeSortedPaths.extractKey uses incorrect
regular expression
Key: IO-886
URL: https://issues.apache.org/jira/browse/IO-886
Project: Commons IO
Issue Type: Bug
Components: Utilities
Affects Versions: 2.21.0
Reporter: Peter De Maeyer
Attachments: image-2026-02-07-14-27-32-345.png
{{PathUtils.RelativeSortedPaths.extractKey}} uses a regular expression with an
escape character to escape a single character separator, but separator is a
string so in theory can be multiple characters. IntelliJ gives an error on this
(the compiler doesn't).
!image-2026-02-07-14-27-32-345.png!
In practice, all file systems have single-character separators AFAIK, so it's
more a theoretical issue.
I suggest to just remove the regular expression, there is no need for it. Just
use an exact string-matching replacement instead.
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