From: jdenny@ces.clemson.edu   
      
   On Mon, 13 Oct 2008 mjmjenks@gmail.com wrote:   
   > It looks like I'm having an issue with the portability of one of my   
   > regular expressions.   
      
   > ScaleFactor [ED]([\+\-]?){digit}+   
      
   Rewrite as:   
      
     ScaleFactor ([ED]([\+\-]?){digit}+)   
      
   Flex adds these parentheses for you.  Lex does not.   
      
   > ({digit}+)[\.]({digit}+)({ScaleFactor}?)    {printf("Real number   
   > token");};   
      
   The difference is whether that "?" after the "{ScaleFactor}" applies to   
   the "{digit}+" at the end of "{ScaleFactor}" or to all of "{ScaleFactor}".   
      
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