rgoers opened a new pull request #677:
URL: https://github.com/apache/logging-log4j2/pull/677


   Reverts to using prior logic but prevents endless conversion. Note that the 
StrSubstitutor implementation had some issues - it still could get a 
StackOverflowError, just in a different scenario. StrSubtitutor.replace returns 
the same string when there is no match whereas strSubst will return an empty 
string when keys don't have a matching value. Given that we don't know how 
users are using this class (they are treating it like a utility method to use 
in their own code) making these changes is the safest approach.


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