Looking for searchable code archives

Question

As part of research for a user group presentation I'm looking for usage examples of certain code constructs.

I'm looking for online source code repository collections that allow me to search inside the source code across the whole collection.

GitHub does it but it's a bit light on the sort of code I'm looking for.

Sourceforge searches only the project description text rather than the source code.

Any others I should try?

Answer 1

Checkout Google Code Search.

Answer 2

Also there is http://www.koders.com/:

Koders.com, a Black Duck Software Company, is a free on-line search engine for open source software and other web-downloadable code.

Over 30,000 developers each day rely on Koders to search over 1 billion lines of code written in over 30 languages and identified with 28 software licenses.

Koders is helping to fuel the open source software revolution. Developers can use this free resource to quickly find the best reusable open source code, methods, examples, algorithms and more, enabling them to be more successful with open source and complete projects faster.