Bug#522093: info: New regex isearch beeps/flashes

[Daniel Jacobowitz <dan@debian.org>]

Package: info
Version: 4.13a.dfsg.1-1
Severity: normal

I use the standalone info viewer, inside screen.  Typing C-s * now
causes the screen to flash about a dozen times.  I believe it's trying
to beep once per character of some error message.

Even more annoying is that this happens for C-s \ (backslash).  You
can't search for anything that requires an escape sequence without
at some point having an invalid regular expression in the buffer.

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.28 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages info depends on:
ii  libc6                     2.9-6          GNU C Library: Shared libraries
ii  libncurses5               5.7+20090314-1 shared libraries for terminal hand

info recommends no packages.

Versions of packages info suggests:
pn  texinfo-doc-nonfree           <none>     (no description available)

-- no debconf information