GNU bug report logs - #15107
24.3; replace-regexp-in-string wrong on \`

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Message #12 received at control <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: control <at> debbugs.gnu.org
Subject: Re: bug#15107: reproduced on emacs-25 branch
Date: Fri, 05 Aug 2016 20:30:14 -0400

tags 15107 confirmed
found 15107 25.1
quit

Michael Wright <wrightmikea <at> gmail.com> writes:

> Kevin Ryde <user42 <at> zip.com.au> writes:
>
>> replace-regexp-in-string behaves incorrectly if a regexp has \` among
>> its matches.
>>
>> (replace-regexp-in-string "\\`\\|X" "Z" "--XX--" t t)
>> =>
>> "Z--ZXZX--"
>>
>> where I expected
>>
>> "Z--ZZ--"
>>
>> This seems to be due to the optimization in replace-regexp-in-string
>> which re-matches on the matched substring. \' can match the substring
>> where it did not match in the middle of the full string. In the example
>> above "X" is the match in the full string, but on taking that "X" as a
>> substring it can match "\\`".
>
> I built the emacs-25 git branch I recreated the above bug today. 

Still the case in 25.1-rc1

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