[$] Searching code with Sourcegraph

Sourcegraph is a tool forsearching and navigating around large code bases.The tool has various searchmethods, including regular-expression search, and "structural search",which isa relatively new technique that is language-aware.The open-source core ofthe tool comeswith code search, go-to-definition and other "codeintelligence" features, which provide ways for developers to makesense of multi-repository code bases. Sourcegraph's code-searching toolscan show documentation for functions and methods on mouse hover and allow developers toquickly jump to definitions or to find all references to a particularidentifier.