Article View: comp.emacs
Article #3289Re: strange replace-regexp behavior
From: Lemming Productions Present...
Date: Mon, 28 Dec 1992 17:28
Date: Mon, 28 Dec 1992 17:28
35 lines
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2520 bytes
>>>>> On Mon, 28 Dec 1992 13:39:23 GMT, pat@gsfc.nasa.gov (patrick m. ryan)
>>>>> said:
Patrick> I was trying to remove a leading column of '>' characters
Patrick> from some text and got some strange behavior from replace-regexp.
Patrick> I have text something like this:
>In article 999, joe@blow said:
>>blah blah blah
>> blah blah blah
Patrick> I wanted to remove the first '>' in each line. Thus, I did:
Patrick> (replace-regexp "^>" "")
Patrick> Instead of removing just the first '>' in each line, it removed
Patrick> the whole sequence of '>' characters. It acted as though I
Patrick> has used "^>*" for the first argument. I ended up with:
Ok, here's the deal. What emacs does is to do a re-search-forward for your
search string, deletes it, and inserts the replacement string. There goes
the "^>". Now, it repeats the re-search-forward. Lo and behold, point is
sitting just to the left of the search string "^>". It gleefully replaces
it with the replacement string, and repeats itself.
You may want to use querey-replace-regexp instead. Or do two replace-regexp
commands, the first change "^>" into something else, like "><", then do a
second replace-regexp on the new string.
--Rat PGP Public Key Block available upon request
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Northeastern's Stainless Steel Rat ratinox@meceng.coe.northeastern.edu
Love is a snowmobile racing across the tundra and then suddenly it flips over,
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--Nietzsche [or Matt Groening]
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Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!hri.com!noc.near.net!lynx!random.ccs.northeastern.edu!news From: ratinox@meceng.coe.northeastern.edu (Lemming Productions Present...) Newsgroups: comp.emacs,gnu.emacs.help,gnu.epoch.misc Subject: Re: strange replace-regexp behavior Message-ID: <RATINOX.92Dec28122732@splinter.coe.northeastern.edu> Date: 28 Dec 92 17:28:34 GMT References: <1992Dec28.133923.27974@nsisrv.gsfc.nasa.gov> Sender: news@random.ccs.northeastern.edu Organization: 3WA, Boston Office. Or Nu Meta Chi. Take your pick. Lines: 35 In-Reply-To: pat@gsfc.nasa.gov's message of Mon, 28 Dec 1992 13: 39:23 GMT Nntp-Posting-Host: splinter.coe.northeastern.edu X-Posting-Software: GNUS 3.14.1 [ NNTP-based News Reader for GNU Emacs ] X-Signature-Virus-Protection: Version 1.51 X-Get-A-Clue: Have two, they're small.