GitHub/Search/How To Search by Filename Anywhere in Repo

• According to this stackoverflow post
  • According to GitHub's help page on Searching Code, under Considerations for code search, it is mentioned that:

  • Except with filename searches, you must always include at least one search term when searching source code. For example, searching for language:javascript is not valid, while amazing language:javascript is.
    

  • So, just searching for extension:feature will not work. You need to use at least one search term. For example, Feature extension:feature, where Feature is a search term.
  • You can also search by language, by using, for example, Feature language:Gherkin.