[?] Closure variables in regular expressions

"Quinn Tyler Jackson" <qjackson@wave.home.com>
19 Jun 1999 17:49:38 -0400

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[?] Closure variables in regular expressions qjackson@wave.home.com (Quinn Tyler Jackson) (1999-06-19)
Re: [?] Closure variables in regular expressions jonathan_barker@my-deja.com (1999-06-27)
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From: "Quinn Tyler Jackson" <qjackson@wave.home.com>
Newsgroups: comp.compilers
Date: 19 Jun 1999 17:49:38 -0400
Organization: Compilers Central
Keywords: lex, question, comment

There are regular expression extensions that do this:


        and this


Has anyone ever seen regular expression extensions that work like this?

        [a-z]+:n %{n}

What this would do is match 1 to many from the character set 'a-z',
and store how many times it did so into n. Then, it would match only
that many of the literal '%'...

Like this:

        abc %%%

        abcdefg %%%%%%%

But not:

        abc %%


        abcdefg %%%%

Any pointers to theory to suggest this would be useful or useless?
Quinn Tyler Jackson
[Looks like it's equivalent in power to backreferences, which can also
count matching pairs of things. -John]

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