From: johnl@taugh.com   
      
   This 2022 paper describes tagged DFA matching of regular expressions that   
   have tags to track which input matched where in the regex.  Tagging is   
   easy when matching with an NFA but harder with a DFA since the tag   
   locations in the NFA may end up combined or split in the DFA.   
      
   It seems pretty clever.  And it does work, implemented in re2c.   
      
   https://arxiv.org/abs/2206.01398   
      
   Regards,   
   John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY   
   Please consider the environment before reading this e-mail. https://jl.ly   
      
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