Re: patsubst: multiline text

[Eric Blake]

On 09/08/2010 03:45 PM, clemens fischer wrote:
> Eric Blake wrote:
>
> > M4 1.4.x only supports the glibc emacs flavor of regexp.  M4 2.0 has
> > improved regex support, allowing you to choose different flavors
> > supported by glibc, such as strict posix, extended regex, and so
> > forth, but still needs tweaking before it will support tunables like
> > case-insensitivity.
>
> So the non-greedy "?" postfix operator is not available below m4-2, did
> I get this right?
>
> It takes so much time to experimentally determine what works and what
> doesn't, would it be possible to document the RE syntax available in
> m4-1.x?  Even if only a README text, it would help quite a bit.

The current regexp syntax already IS documented.  In the m4 manual,
http://www.gnu.org/software/m4/manual/m4.html#Regexp has a link to:
http://www.gnu.org/software/emacs/manual/html_node/emacs/Regexps.html#Regexps

(well, I had to click through a few pages to find it; perhaps we can 
patch the m4 manual to have a more direct link...)

--
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org