From: Hugh Sasse Staff Elec Eng <hgs@...>
Date: 2002-02-05T03:39:22+09:00
Subject: Re: bash-like command splitting (for regexp wizards)

On Tue, 5 Feb 2002, Massimiliano Mirra wrote:

> On Mon, Feb 04, 2002 at 11:57:23AM +0900, Jeff 'japhy' Pinyan wrote:
>
> > >dividers = ['\|\|', '&&', ';']
> > >divs = dividers.collect {|div| "(#{div})"}.join('|')
>                                    ^      ^
> > That regex does not do what you think it does...
> >
> >   /([^jeff]+)|jeff/
> >
> > does not mean "one or more non-jeff's in a row, OR jeff", but rather "one
> > or more non-j's, non-e's, and non-f's in a row, OR jeff".
>
> But that regex is (note parentheses above):
>
> /([^(\|\|)|(&&)|(;)]+|(\|\|)|(&&)|(;)/

I think it will interpret the [] as a character class...
>
	[...]
> Can someone point out some easy, task-oriented yacc documentation (if

I know of:
http://www.combo.org/lex_yacc_page/
and
http://www.cc.gatech.edu/classes/cs4410_98_fall/yacc.html

A look with google turned up this, which might be good:
http://ds9a.nl/lex-yacc/

> any such thing exists)?  All I've found is very feature-oriented, I'd
> prefer (shall I say need?) something in the ``to get this, do this''
> style.

I never found getting them to work easy.  I did write a yacc-analyser in
Perl4, but it will be lots of work to rubify it I think.
>
>
> Thanks a lot!
>
> Massimiliano
>
	Hugh