fail2ban/config/filter.d/apache-common.conf

# Generic configuration items (to be used as interpolations) in other
# apache filters.

[INCLUDES]

# Load customizations if any available
after = apache-common.local

[DEFAULT]

_apache_error_client = \[\] \[(error|\S+:\S+)\]( \[pid \d+:\S+ \d+\])? \[client <HOST>(:\d{1,5})?\]

# Common prefix for [error] apache messages which also would include <HOST>
# Depending on the version it could be
# 2.2: [Sat Jun 01 11:23:08 2013] [error] [client 1.2.3.4]
# 2.4: [Thu Jun 27 11:55:44.569531 2013] [core:info] [pid 4101:tid 2992634688] [client 1.2.3.4:46652]
#
# Reference: https://github.com/fail2ban/fail2ban/issues/268
#
# Author: Yaroslav Halchenko