srdo edited a comment on pull request #644:
URL: https://github.com/apache/logging-log4j2/pull/644#issuecomment-1001000089


   > Should we return the input, or the pieces that we could successfully 
replace
   
   Neither string is likely to be the output the author wanted I think. If this 
case is hit, the person monitoring the logs should become aware that there is a 
bug to fix, due to the status logger. I'm not sure if it makes a great 
difference which of the wrong log outputs they get back?
   
   A minor benefit of returning the original string is that it might be easier 
to grep for?
   
   The note about try-catching makes sense, I could add a try-catch to 
`substitute` so it is not possible to forget to handle the exception?


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