nevir/groc — pull request #119 by kayleg (2013-09-18 01:04:04+00:00)
Title: '@' symbol as first character in code block is parsed as a doctag

In languages like ruby and coffee script, it is likely that a code example will start with '@'

By changing the regex to remove the or operator it can be fixed to match only if there is one or no space, not 4 spaces signifying a code block

`(?:^|\s)`
should be
`^\s?`