Go clone of ed(1), the famous line-oriented text editor that is originally from the 1970s. Simply put, the UNIX text editor.
This version of ed aims to be a bug for bug implementation of the original. The only thing that differs is that this version uses RE2 instead of BRE (basic regular expresions). The reason for this is that the Go programming languages standard library uses that in the regexp package.
godoc -notes 'TODO'
go build
./ed file