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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 13 Sep 2012 12:54:41 -0600
Subject: Re: equiv of perl regexp grammar?
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On Thu, Sep 13, 2012 at 5:30 AM, Neal Becker <ndbecker2@gmail.com> wrote:
> I noticed this and thought it looked interesting:
>
> http://search.cpan.org/~dconway/Regexp-
> Grammars-1.021/lib/Regexp/Grammars.pm#DESCRIPTION
>
> I'm wondering if python has something equivalent?

The pyparsing module is a good option for building grammar parsers.
There's nothing that I know of that tries to slot them into regular
expressions like that.