ENH: separate out regex and escape a .

config/filter.d/common.conf

@@ -38,6 +38,9 @@ __kernel_prefix = kernel: \[\d+\.\d+\]
 
 __hostname = \S+
 
+
+__bsd_syslog_verbose = (<[^.]+\.[^.]+>)
+
 #
 # Common line prefixes (beginnings) which could be used in filters
 #
@@ -47,4 +50,4 @@ __hostname = \S+
 # <auth.info> appearing before the host as per testcases/files/logs/bsd/*.
 #
 # This can be optional (for instance if we match named native log files)
-__prefix_line = \s*(<[^.]+.[^.]+>)?\s*(?:%(__hostname)s )?(?:%(__kernel_prefix)s )?(?:@vserver_\S+ )?%(__daemon_combs_re)s?\s*
+__prefix_line = \s*%(__bsd_syslog_verbose)s?\s*(?:%(__hostname)s )?(?:%(__kernel_prefix)s )?(?:@vserver_\S+ )?%(__daemon_combs_re)s?\s*