GNU bug report logs - #79811
29.3; query-replace-regexp with \, and ^ (previous match) uses wrong match

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "Miguel V. S. Frasson" <mvsfrasson <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.3;
 query-replace-regexp with \, and ^ (previous match) uses wrong match
Date: Mon, 10 Nov 2025 22:10:51 -0300

When running interactively query-replace-regexp using \, in match string
to eval some lisp code on replacement, if one invokes previous match
with `^' followed by `y' (replace match), the replacement is done with
next match :-(

To reproduce the bug:

1) emacs -Q

We land on *scratch* buffer, whose text begins with ";; This buffer is for ..."

2) Go to beginning of text, on 1st `;'

3) Perform the following query-replace-regexp

C-M-% \([aeiou]\) RET \,(upcase \1) RET

4) Accept first with `y'.  Text becomes ";; ThIs buffer is for ..." and match
goes to `u'.

5) Deny second with `n', match goes to `e'.

6) Perform previous match with `^', match returns to `u'.

7) Now the bug: current match is `u', then accept with `y'.

Result:   ;; ThIs bEffer is for...

Replacement was done as if the current match was `e', not `u'.

Expected: ;; ThIs bUffer is for...

In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
 cairo version 1.18.0) of 2024-04-01, modified by Debian built on
 lcy02-amd64-083
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Ubuntu 24.04.3 LTS

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.3/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.3/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --with-cairo --with-x=yes
 --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
 -ffile-prefix-map=/build/emacs-0yuuFP/emacs-29.3+1=. -fstack-protector-strong
 -fstack-clash-protection -Wformat -Werror=format-security
 -fcf-protection
 -fdebug-prefix-map=/build/emacs-0yuuFP/emacs-29.3+1=/usr/src/emacs-1:29.3+1-1ubuntu2
 -Wall' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=3'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2
XPM GTK3 ZLIB

Important settings:
  value of $LANG: pt_BR.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils time-date thingatpt
cl-loaddefs comp comp-cstr warnings icons subr-x rx cl-seq cl-macs gv
cl-extra help-mode bytecomp byte-compile cl-lib rmc iso-transl tooltip
cconv eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow
isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
composite emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
native-compile emacs)

Memory information:
((conses 16 77280 10744)
 (symbols 48 7183 0)
 (strings 32 19569 1449)
 (string-bytes 1 589011)
 (vectors 16 15349)
 (vector-slots 8 324678 17351)
 (floats 8 29 42)
 (intervals 56 299 0)
 (buffers 984 11))

-- 
Miguel Vinicius Santini Frasson
mvsfrasson <at> gmail.com

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