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unnamed-faq-100

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

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