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Re: using non-Emacs regexp syntax

From: Paul Pogonyshev
Subject: Re: using non-Emacs regexp syntax
Date: Wed, 29 Nov 2006 21:13:19 +0200
User-agent: KMail/1.7.2

David Kastrup wrote:
> "Drew Adams" <address@hidden> writes:
> >>     Is there a function to convert non-Emacs regexps (e.g. "ab(c+|d)" to
> >>     Emacs regexps (example to "ab\(c+\|d\)")?
> >>
> >> The first form appears to be an "extended regexp" or egrep-style regexp.
> >> The second appears to be a "basic regexp" or grep-style regexp.
> >>
> >> This conversion feature in Lisp would be useful to add after the release.
> >
> > Very glad to hear that.
> >
> > I'm hoping there will also be support for toggling the newline sensitivity
> > of dot. This means a "doc-matches-newline" mode (aka "single-line" mode)
> > where `.' will also match newline. Please see the thread "short regexp to
> > match any character?" from 2006/03/04 and 03/11.
> I don't know any other matcher where dot matches a newline.  Quite
> more relevant would be inverse character ranges like [^A-Z] that do
> _not_ match newline by default.

As far as I remember, Perl regexp syntax has a flag to match or not match
newline by default.  Emacs could adopt a similar flag facility, or use native
flag variables (like `case-fold-search', just with a different meaning.)


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