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Re: Occur buglet


From: era
Subject: Re: Occur buglet
Date: 10 Mar 2004 10:27:29 +0200
User-agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7

On Fri, 05 Mar 2004 14:50:50 -0500, Morten Welinder <address@hidden>
posted to bug-gnu-emacs:
 > 1 line matching "^[+][^+]" in buffer *scratch*.
 >       2:+
 >        : hi
 > It is debatable whether there should be a match -- grep would not have
 > found it -- but the listed thing is not one line, but two.

The string which matches [^+] is the newline of line 2. Emacs regex
negated classes will include newline unless you explicitly exclude it.
The regex [^+\n] matches what you'd express as [^+] in grep. Since
grep is line-oriented, but Emacs is buffer-oriented, this distinction
makes sense.

Furthermore, there is nowhere any assertion that occur and grep should
match exactly the same things -- there are numerous other differences,
all of which are hopefully adequately documented.

/* era */

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