Logcheck devel - Mar 2007 - Bug#413364: logcheck ignores cron rules for "session closed" and "session opened"

Package: logcheck
Version: 1.2.54
Severity: normal

In the file ignore.d.paranoid/cron there are the rules 

^\w{3} [ :0-9]{11} [._[:alnum:]-]+ CRON\[[0-9]+\]: \(pam_[[:alnum:]]+\) session
opened for user [[:alnum:]-]+ by \(uid=[0-9]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ CRON\[[0-9]+\]: \(pam_[[:alnum:]]+\) session
closed for user [[:alnum:]-]+$

to ignore lines like

10:17:01 at 04-03-2007 tooar CRON[6356]: (pam_unix) session opened for user root
by (uid=0)
10:17:01 at 04-03-2007 tooar CRON[6356]: (pam_unix) session closed for user root

but I still get emails from logcheck with those lines.

I've tried to test the rules by doing

egrep -v -f ignore.d.paranoid/cron /var/log/messages  |grep session

which correctly shows those "session opened" and "session
closed" lines. So I don't know why logcheck still sends me emails with
those lines. This looks like a bug to me.

-- System Information:
Debian Release: 4.0
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.16tooar3
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)

Versions of packages logcheck depends on:
ii  adduser          3.102                   Add and remove users and groups
ii  cron             3.0pl1-100              management of regular background p
ii  debconf          1.5.11                  Debian configuration management sy
ii  grep             2.5.1.ds2-6             GNU grep, egrep and fgrep
ii  lockfile-progs   0.1.10                  Programs for locking and unlocking
ii  logtail          1.2.54                  Print log file lines that have not
ii  mailx            1:8.1.2-0.20050715cvs-1 A simple mail user agent
ii  postfix [mail-tr 2.3.7-3                 A high-performance mail transport 
ii  syslog-ng [syste 2.0.0-1                 Next generation logging daemon

Versions of packages logcheck recommends:
ii  logcheck-database             1.2.54     database of system log rules for t

-- debconf information:
* logcheck/install-note:
  logcheck/changes: