You can search for that regular expression on Sourcegraph (disclaimer: I work there) https://sourcegraph.com/search?q=context:global+strstr%5Ba-z...
Some feedback:
* Copy & Paste does not work. When trying to select text from code snippets, the code is dragged like an image instead of being selected.
* The GitHub icon during search is not clickable. Clicking to the right of the GitHub icon does not go to GitHub but instead shows an embedded view of that repository. There, the GitHub icon somewhere on the right is a bit hard to find (maybe write "View on GitHub" next to it so it is discoverable with Ctrl + F?), but at least it is clickable.