From: gneuner2@comcast.net   
      
   On Sun, 27 Aug 2017 18:25:41 +0100, Ulya Trofimovich   
    wrote:   
      
      
   >As it turns out, submatch extraction is inherently more complex than   
   >recognition: it can be solved on NFA, but not on (ordinary) DFA.   
      
   I don't know what this means ... every NFA has an equivalent DFA, so   
   if a problem can be solved with NFA, it can be solved with DFA.   
      
   George   
      
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