Microsoft today announced a “limited preview” of new Code Search capability. Since it is a limited preview, you will have to request to get access and Microsoft will only enable a certain number of accounts. Code Search enables you to quickly and easily search across your entire account and find matches using your web browser. Not only can you perform full text matching but for some languages, like C#, C and C++, and additional ones in the future, it understands the structure of your code and allows you to search for specific contexts, like class definitions, comments, properties, etc.
You can read more about the new feature and how to get signed up to pilot it here.