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     To: Martin Gallwey <gallweym@hyperion.moe.ul.ie>
     Subject: Re: Flex, and self referencing rules
     In-reply-to: Your message of Sun, 20 Feb 2000 01:01:21 PST.
     Date: Sat, 19 Feb 2000 18:33:16 PST
     From: Vern Paxson <vern>
     
     > However, I do not use unput anywhere. I do use self-referencing
     > rules like this:
     >
     > UnaryExpr               ({UnionExpr})|("-"{UnaryExpr})
     
     You can't do this - flex is *not* a parser like yacc (which does indeed
     allow recursion), it is a scanner that's confined to regular expressions.
     
     		Vern