bug#14303: 24.3; Bug in comment-search-backward

[Andreas Röhler]

Am 17.05.2013 15:37, schrieb Leo Liu:
> On 2013-05-17 21:28 +0800, Stefan Monnier wrote:
> > I don't understand when that can happen (when inside a string (nth
> > 8 ppss) is also non-nil).
>
> I have
>
> (defvar octave-comment-start-skip "\\(^\\|\\S<\\)\\(?:%!\\|\\s<+\\)\\s-*"
>    "Octave-specific `comment-start-skip' (which see).")
>
> and this could find "#abc" as comment start where BEG is outside of
> strings and comments but END is in a string.
>
> Maybe this is due to setting octave-comment-start-skip incorrectly.
>
> I looked at comment-normalize-vars and see it uses:
>
>    \\(\\(^\\|[^\\\n]\\)\\(\\\\\\\\\\)*\\)
>
> as anchor but I don't understand fully.
>
> Leo

BTW what is the fastest way moving backward --searching comment-- when not 
inside a comment?

Thought at

(forward-line -1)
(end-of-line)
ppss-Check-for-Comment-again

maybe re-search-backward is as fast?

Andreas