Re: [O] Stack overflow in regexp matcher

[Charles C. Berry]

On Sat, 25 Oct 2014, Charles C. Berry wrote:

> On Fri, 24 Oct 2014, Gregor Zattler wrote:
>
> > Hi Charles, org-mode developers
> > * Charles Berry <address@hidden> [24. Oct. 2014]:
> > > I do. Try this. Start emacs 24.4.1.
> > >
> > > 1) Copy this line:
> > >
> > >     CLOCK: [2013-07-22 Mon 12:29]--[2013-07-22 Mon 15:26] =>  2:57
> > >
> > > into a new *.org file.
> > >
> > > 2) Save and close the file and reopen.
> > >
> > > 3) If no such error, kill the text in the buffer, and yank it twice.
> > >
> > > 4) Repeat 2 and 3 till the message
> > >
> > >    File mode specification error: (error "Stack overflow in regexp 
> > > matcher")
> > >
> > > shows up.
> > >
> > > 5) prune lines from the file and try step 2 till the error disappears.

[snip]

> It turns out that
>
>  (re-search-forward "^[^%]*\\\\usepackage.*{biblatex}" nil t))
>
> in reftex-using-biblatex-p is the culprit.
>
> So, the ECM is to save a file like that decribed above without the *.org 
> extension.
>
> Open it (in fundamental mode) and issue
>
> M-: (re-search-forward "^[^%]*\\\\usepackage.*{biblatex}" nil t))
>
> and get
>
> eval: Stack overflow in regexp matcher
>
> So, maybe this is not an org-mode issue. ??


Further, changing that regexp to

 "^[^%\n]*\\\\usepackage.*{biblatex}"

and byte-compiling reftex-parse.el.gz seems to make the problem go away.

This seems to be well-known problem:

   http://www.emacswiki.org/emacs/MultilineRegexp

Still, I am not sure why this happens in 24.4.1 and not previously.

HTH,

Chuck