cc: [email protected]
Subject: Re: Re: [ast-developers] Re: Get ~(E) fixed or remove it
--------
> Lets say, I'm not happy with the number of issues with ~(....) either
> > but please do not do such drastic steps.
> > I think the problem is:
> > 1. Lack of clear rules how quoting in ~(....), especially ~(E), works
> > 2. Lack of clear documentation of said rules
> > 3. Lack of diagnostics, e.g. it is not possible for a script developer
> > to check how, and I consider neither gdb nor dbx options here, the
> > grep/egrep/xgrep/pcre pattern looks like when it is passed to
> > regcomp()
> >
> > Irek
> >
The shell quoting rules, and the ere quoting rules are not always
the same, so for complex patterns, I recommand using
pattern='~(E)...'
and
${var/$pattern/string}
This should always work. If it doesn't, this is a bug.
~(E) patterns are useful so removing them is counter productive.
David Korn
[email protected]
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