For people interested in searching code using an open source solution, you might be interested in Zoekt too, github.com/google/zoekt.<p>There is a demo site where you can search 30G of source code (including the Linux kernel, Android and Chrome) supporting regular expressions, and file name search:<p><a href="https://cs.bazel.build/?q=%20" rel="nofollow">https://cs.bazel.build/?q=%20</a><p>For example, <a href="https://cs.bazel.build/search?q=+r%3Atorvalds+craz%5Byi%5D&num=50" rel="nofollow">https://cs.bazel.build/search?q=+r%3Atorvalds+craz%5Byi%5D&n...</a> looks for craz[iy] across the Linux kernel.