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Re: Whitespace search and regex.c

From: Stefan Monnier
Subject: Re: Whitespace search and regex.c
Date: Fri, 26 Nov 2004 17:12:25 -0500
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/21.3.50 (gnu/linux)

>> It is for the sake of user-level search features that
>> want a series of SPCs to stand for some broader kind of whitespace.

>     I'm afraid that doesn't tell me really what it is for.  I.e. why is it
>     implemented this way rather than some other way?  What was the
>     precise goal?

> This was the easiest way I could find to do it reliably.
> It avoids the need to write other code to parse a regexp.
> I did not want to do that; I figured it would be a pain.

Well, another easy way goes as follows:

      (defun in-brackets-p (regex pos)
        "Return non-nil if POS is within brackets in REGEX."
        (condition-case err
              (string-match (substring regex 0 pos) "")
          (error (equal (cadr err) "Unmatched [ or [^"))))

-- Stefan

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