graphite-project/graphite-web — pull request #981 by nzlosh (2014-10-03 09:40:22+00:00)
Title: Register "grep" as a render series function

When using the function grep(series, pattern) the following error is reported:

KeyError at /render/ u'grep'

The fix is to register the keyword "grep" with the existing grep function in the SeriesFunctions dictionary.