Re: regular expression operators in CF grammars

kgw-news@stiscan.com
28 Jun 2002 18:14:20 -0400

          From comp.compilers
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From: kgw-news@stiscan.com
Newsgroups: comp.compilers
Date: 28 Jun 2002 18:14:20 -0400
Organization: Solution Technology
References: 02-05-142 02-05-151 02-06-024 02-06-044 02-06-054 02-06-063
Keywords: parse
Posted-Date: 28 Jun 2002 18:14:20 EDT

On Fri, 21 Jun 2002 01:45:01 UTC, kgw-news@stiscan.com wrote:


> On Mon, 17 Jun 2002 04:12:39 UTC, "Ralph Boland" <rboland@unb.ca>
> wrote:
>
> > Meanwhile if there are other regular expression operators that are
> > useful for parsing I would be interested in knowing; I will consider
> > implementing them.
> >
>
> Try looking at the Algol68 meta-productions to see if there
> are any other ideas. But I think you have the main ones.
> ? covers -ETY
> ^ covers -LIST, -TRAIN etc.
> + covers -SEQUENCE(?)
>
I did find one more.


You have A ( B A )* for list
There is A ( B A )+ for proper list.


--
All the above is hearsay and the not quaranteed.

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