From: dickey@saltmine.radix.net   
      
   Joel C. Salomon  wrote:   
   > whiskey wrote:   
   >> how would a regular expression that matches a regular   
   >> expression look like ?   
      
   > Which flavor of regexp?  But that hardly matters; since parenthesis and   
   > brackets must be matched in a valid regexp, regular expressions cannot   
   > themselves be described by a regular language.   
      
   otoh, I got reasonably good (but bulky) results for the parser of lex   
   source written in lex/flex for vile.  It took several levels of expressions   
   to do that, though.   
      
   --   
   Thomas E. Dickey   
   http://invisible-island.net   
   ftp://invisible-island.net   
      
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