Git commits in Moodle 2.3.x by Lorenzo Nicora

commit 203e8d40321b8002a4d7213724089f5eacac6eab
Author: Lorenzo Nicora <lorenzo.nicora@gmail.com>
Date:   Sun, 10 Jun 2012 15:25:19 +0800
Tag:    v2.3.2

MDL-33531 Fixed the regexp to find old backup files, considering backup_shortname backup option