+2020-01-02 Paul Eggert <eggert@cs.ucla.edu>
+
+ doc: mention glibc bug 24269
+ * doc/regex.texi (Back-reference Operator): Add glibc bug 24269.
+ Reformat slightly so that it looks nicer in the Grep manual.
+
2020-01-02 Bruno Haible <bruno@clisp.org>
mbrtowc: Don't replace mbstate_t on MSVC.
back-references is at times unclear. Furthermore, many regular
expression implementations have back-reference bugs that can cause
programs to return incorrect answers or even crash, and fixing these
-bugs has often been low-priority---for example, as of 2019 the GNU C
-library bug database contained back-reference bugs
-@url{https://sourceware.org/bugzilla/show_bug.cgi?id=52,52},
-@url{https://sourceware.org/bugzilla/show_bug.cgi?id=10844,10844},
-@url{https://sourceware.org/bugzilla/show_bug.cgi?id=11053,11053},
-and @url{https://sourceware.org/bugzilla/show_bug.cgi?id=25322,25322},
+bugs has often been low-priority: for example, as of 2020 the
+@url{https://sourceware.org/bugzilla/,GNU C library bug database}
+contained back-reference bugs
+@url{https://sourceware.org/bugzilla/show_bug.cgi?id=52,,52},
+@url{https://sourceware.org/bugzilla/show_bug.cgi?id=10844,,10844},
+@url{https://sourceware.org/bugzilla/show_bug.cgi?id=11053,,11053},
+@url{https://sourceware.org/bugzilla/show_bug.cgi?id=24269,,24269}
+and @url{https://sourceware.org/bugzilla/show_bug.cgi?id=25322,,25322},
with little sign of forthcoming fixes. Luckily,
back-references are rarely useful and it should be little trouble to
avoid them in practical applications.