Removing a keyword from git history

I recently had to remove a keyword from the git history of a project I was working on. This meant not just removing a file but modifying commits where the keyword was added, commits where the keyword was removed, and even commits with the keyword in the commit message. I eventually came to the right solution through a mix of blog posts and the documentation for git rebase. For this example, assume the keyword is “matrix”.
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Matrix registration

Matrix is a federated, open source chat system. By federated, we mean that people can communicate across different servers, like in the image on the right. In that way, it works sort of like email: even though you may use and I might use, we can still write each other emails. In our case, I host the server at, and you and I can connect to it with various clients.
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