Graylog2/graylog2-server — pull request #487 by h0nIg (2014-03-22 19:38:43+00:00)
Title: implemented java regex Pattern cache

implemented java regex Pattern cache, since it is really cost intensive to create a pattern for every message

Pattern.matches()
"If a pattern is to be used multiple times, compiling it once and reusing it will be more efficient than invoking this method each time"