[3.12] gh-124130: Notes on empty string corner case of category \B (GH-124133)
          #124329
        
          
      
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(cherry picked from commit d3e79d7)
Co-authored-by: Y5 [email protected]
Signed-off-by: y5c4l3 [email protected]
Co-authored-by: Bénédikt Tran [email protected]
📚 Documentation preview 📚: https://cpython-previews--124329.org.readthedocs.build/