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`ed` regexes

Just /re/ would find the next line in the file that matched

/re/command would find a matching line and execute the command

g/re/command would execute the command globally

that is, on each matching line

If the command was p, it would print the matching line:

     g/re/p     # print all lines maching a pattern

And that's where we get the word "grep"

        GREP(1)                                                                 GREP(1)
        
        NAME
               grep – print lines matching a pattern