dan-robertson commented on issue #15182:
URL: https://github.com/apache/lucene/issues/15182#issuecomment-3286165141

   Hmm, reading the docs of RegExp, I think you’re right, but those docs also 
imply that `(|b)` and `(b|)` should be treated similarly (either both allowed 
or both disallowed) which is not what we observe above.
   
   Nevertheless, it seems like not accepting such expressions is undesirable 
considering that most otherwise similar regexp syntaxes do accept such 
expressions.


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