Author of the blog post here. The code search functionality is the same as what Google engineers use internally. Cloud Source Repositories uses the same indexi

Author of the blog post here. The code search functionality is the same as what Google engineers use internally. Cloud Source Repositories uses the same indexing and retrieval technologies on the same type of infrastructure. As you mention, the more code you have, the more benefit you get from having fast search tools across your entire code base that can perform complex semantic and regular expression queries. Even with smaller codebases, I find it the fastest way to find the code I need. (Disclaimer: I work at Google and am the PM on this product)