How to search tracked files for multiple patterns?

git grep -e pattern1 -e pattern2

To search tracked files for multiple patterns use git grep -e pattern1 -e pattern2 -e patternN, where each pattern is listed after an -e parameter.

git grep -e README -e name

README.md:Updating the contents of the README file.

code.rb:def say_bye(name)

code.rb:  "Bye, #{name}"

See git grep to learn more about it.