RIP Google Code Search :(

For reference, you used to be able to do this - https://code.google.com/p/chromium/codesearch - with an archived cross-section of code on the Web.

I wonder if we'll ever be able to do regex Google searches in the future, or if AI/machine learning will make that sort of flexibility redundant by the time the hardware would be able to handle it.

FWIW codesearch's spirit lives on with debian code search (https://codesearch.debian.net/) which allows you to do the same as codesearch, except for Debian only. Checkout also the thesis behind (https://codesearch.debian.net/research/bsc-thesis.pdf) that explains a lot about the challenges and the architecture.