twitter/twitter-text-conformance — pull request #32 by katsuyan (2012-01-31 04:45:41+00:00)
Title: Add test cases to catch the case when mentions are preceded by special symbols.

I made extraction of mentions slightly more strict.
Now it does not extract mentions precedented by !, @, #, $, %, & and .
This avoids extracting unintended mentions like "f@KN", which, in turn, reduces spams in users mention section.