Sourcegraph (disclaimer: where I work) code search returns ~2700 results (more than the other 2 linked) and properly matches the "(" (which GitHub's current code search incorrectly ignores).

https://sourcegraph.com/search?q=context:global+boolean+isCy...

(Still, awesome to see more code search tools get built! Most devs aren't using code search and have no idea why it's awesome, so anything that changes that is a huge help.)

Wow, the Sourcegraph search is returning results I couldn’t find yesterday on GitHub. Bookmarked.

Terrific, thank you!

There's also cs.github.com which is fantastic and in beta at the moment.

Doesn't it ignore special characters like : , . ( ) etc.?

I remember struggling to find function definitions because `f(` would be treated like `f`

I've also not found a way to filter out tests. I know tests are also code, but most of the time I am not interested in them.

You've got to put the search string in quotes.