githubsearch
GitHub has a search system, building on elastic search that has many advanced features like searching for repositories or users. Using Google, I can search GitHub for alternatives. The search syntax of GitHub however only covers negation operator.
How do I use other logic operators in GitHub's search?
Is there perhaps a feature in elastic search that can be exploited for filtering or combining Boolean queries?
I found the following list which lets users fine-tune their search query.
If the search engine crawlers honour the robots.txt then no, you won't be able to use external search engines to search for code hosted on GitHub.
Here's the line from their robots.txt file disallowing that:
Disallow: /*/*/blob/*
If you go jumping about repos you'll see the path to the source code is something like this:
https://github.com/asciidoctor/asciidoctor/blob/master/lib/asciidoctor.rb
This matches the rule and thus, you won't get anything back when using compliant search engines.
Best Answer
GitHub's built in search covers the
and,not, andoroperators, as well as various other comparisons. GitHub's general guidelines on searching are located here: https://help.github.com/articles/searching-github/With its search syntax described here: https://help.github.com/articles/search-syntax/