From: haberg_20080406@math.su.se   
      
   Hans-Peter Diettrich wrote:   
   > Unicode introduces a couple of problems into lexers, which I don't want   
   > to discuss too deeply. Most important seems to be the expansion of the   
   > character codes, from single to multiple bytes.   
      
   Unicode regular expressions can be lexed directly by rewriting into UTF.   
   I posted some Haskell function for doing that here   
      http://lists.gnu.org/archive/html/help-flex/2005-01/msg00043.html   
      
      Hans Aberg   
      
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