Re: `looking-back' strange warning

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

Am 01.10.2015 um 10:20 schrieb Tassilo Horn:
> Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
>
>>>> Docu bug?
>>> It's a feature: calling `looking-back' without LIMIT is slow, don't do that.
>> Hmm, would volontier to make that fast instead - if write-permission
>> is given :)
> Looking at the code, I'd say `looking-back' is only slow if GREEDY is t
> in which case the start of the match may be before LIMIT anyhow.  So I
> don't see how providing a LIMIT would help too much, or is
> `re-search-backward' already slow without LIMIT?

AFAIK thats it.

Also "greedy" seems not to work at all:

(defun foo3 ())

(progn (re-search-backward "o+" nil t 3)
        (message "%s" (match-beginning 0)))

The first "o" is reported as match-beginning.