Google Code Search is the only service I have been missing. And it is not on this list. Code search had a good regex search and nice options for searching base

Google Code Search is the only service I have been missing. And it is not on this list. Code search had a good regex search and nice options for searching based on metadata. GitHub's newly launched code search is not good enough (yet) and doesn't have a big enough haystack to search in. The prime use case for code search was finding example code of badly documented APIs.