ppkarwasz commented on issue #4001:
URL: 
https://github.com/apache/logging-log4j2/issues/4001#issuecomment-3647258802

   The problem occurs if `filePattern` contains something that matches 
`.*%(?<ZEROPAD>0)?(?<PADDING>\d+)?i.*`, but it doesn't actually contain any 
valid `%i` pattern.
   
   Patterns such as `%%i` match the regex without being a true `%i`, which 
causes the method to fail.


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