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flex: If I have a simple grammar cant I just parse it with flex?

 
 If I have a simple grammar can't I just parse it with flex?
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 Is your grammar recursive?  That's almost always a sign that you're
 better off using a parser/scanner rather than just trying to use a
 scanner alone.
catalog Info Catalog previous flex: How much faster is -F or -f than -C? up flex: FAQ next flex: Why doesn't yyrestart() set the start state back to INITIAL?