isc-dhcp 4.2.4-5's DHCPREQUEST messages no longer match ignore regex

After upgrading my raring VMs to the latest isc-dhcp:

    isc-dhcp (4.2.4-5ubuntu1) raring; urgency=low
    isc-dhcp (4.2.4-5) unstable; urgency=medium

logcheck's email now includes DHCPREQUEST messages. This is very annoying when deployed in a OpenStack since the client does a DHCP request every minute or so ;)

Here are some messages that are correctly filtered out:

$ zcat syslog.7.gz |grep DHCPRE | head -4
Feb 20 06:39:37 server-43cadf07-0162-4924-a329-f522bd6f0490 dhclient: DHCPREQUEST of 192.168.2.2 on eth0 to 192.168.2.1 port 67
Feb 20 06:40:30 server-43cadf07-0162-4924-a329-f522bd6f0490 dhclient: DHCPREQUEST of 192.168.2.2 on eth0 to 192.168.2.1 port 67
Feb 20 06:41:23 server-43cadf07-0162-4924-a329-f522bd6f0490 dhclient: DHCPREQUEST of 192.168.2.2 on eth0 to 192.168.2.1 port 67
Feb 20 06:42:15 server-43cadf07-0162-4924-a329-f522bd6f0490 dhclient: DHCPREQUEST of 192.168.2.2 on eth0 to 192.168.2.1 port 67

And here are messages now appearing in the email:

This email is sent by logcheck. If you no longer wish to receive
such mail, you can either deinstall the logcheck package or modify
its configuration file (/etc/logcheck/logcheck.conf).

System Events
=-=-=-=-=-=-=
Feb 27 08:02:48 server-43cadf07-0162-4924-a329-f522bd6f0490 dhclient: DHCPREQUEST of 192.168.2.2 on eth0 to 192.168.2.1 port 67 (xid=0x593f7ff6)
Feb 27 08:03:36 server-43cadf07-0162-4924-a329-f522bd6f0490 dhclient: DHCPREQUEST of 192.168.2.2 on eth0 to 192.168.2.1 port 67 (xid=0x593f7ff6)
Feb 27 08:04:28 server-43cadf07-0162-4924-a329-f522bd6f0490 dhclient: DHCPREQUEST of 192.168.2.2 on eth0 to 192.168.2.1 port 67 (xid=0x593f7ff6)
Feb 27 08:05:14 server-43cadf07-0162-4924-a329-f522bd6f0490 dhclient: DHCPREQUEST of 192.168.2.2 on eth0 to 192.168.2.1 port 67 (xid=0x593f7ff6)

It looks like the xid text is not matched.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: logcheck-database 1.3.15
ProcVersionSignature: Ubuntu 3.8.0-7.15-generic 3.8.0
Uname: Linux 3.8.0-7-generic x86_64
ApportVersion: 2.8-0ubuntu4
Architecture: amd64
Date: Wed Feb 27 09:21:51 2013
Dependencies:

Ec2AMI: ami-0000000e
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: ec2-m1.small
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 SHELL=/bin/bash
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
SourcePackage: logcheck
UpgradeStatus: No upgrade log present (probably fresh install)