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Re: skip-chars-forward v. re-search-forward


From: Kenichi Handa
Subject: Re: skip-chars-forward v. re-search-forward
Date: Thu, 1 May 2003 16:11:00 +0900 (JST)
User-agent: SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.2 Emacs/21.2.92 (sparc-sun-solaris2.6) MULE/5.0 (SAKAKI)

In article <address@hidden>, Richard Stallman <address@hidden> writes:
>     It's still surprising that search-forward/backward is more
>     than twice faster.  I have no idea what kind of magic the
>     boyer-moore search is using.

> The comparison between search-forward and skip-chars-forward
> does not seem meaningful to me, because they do different jobs.
> The only case which both of these functions can do is
> (search-forward "a") and (skip-chars-forward "^a").

That is what I did in my benchmark test.
  (search-forward "%")
    vs (skip-chars-forward "^%")
    vs (re-search-forward "[%]")

> The time taken by search-forward is inversely proportional to the
> search string size in favorable cases, so if you tried a longer
> string, it was probably faster.

Yes, I know that.  I was surprised because search-forward
was twice faster even if the search string size is one.

---
Ken'ichi HANDA
address@hidden





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