elasticsearch/logstash — pull request #1224 by kanarip (2014-04-06 14:01:16+00:00)
Title: Allow backslash ('\') and at ('@') characters in USERNAME grok pattern

Allow backslash ('\') and at ('@') characters as part of the auth field in standard combined Apache httpd log entries (field #3).

Necessary in order to be able to parse the log entries provided as samples / tests.