From: dot@dotat.at   
      
   "Lowell Thomas"  wrote:   
   >   
   >Parsing Expression Grammars are an interesting solution to the problem,   
   >but I don't think this one quite succeeds. In the term   
   >   
   >!(attr* attr1 attr*)   
   >   
   >it is my understanding is that the "*" operator is "greedy" and   
   >will always consume the entire remainder of the string,   
   >assuming all attributes are syntactically correct. Then   
   >the concatenation with attr1 will always fail (and hence the   
   >negative syntactic predicate will always succeed.)   
      
   Oops, yes you are right. The fix is similar to the one you gave in your   
   SABNF version, i.e. replace the attr in attr* expression with an   
   expression that doesn't match attr1: (!attr1 attr)   
      
   Tony.   
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