[ezequiel-garzon]

Thanks for sharing! I should admit I don't do any professional work with text editors (hopefully some day!), and if I ever do ed will likely not be my main editor. Just so you know, you can use most non-blank characters for substitutions. Personally I tend to use commas, as somebody else mention in the comments. If I see commas in the expression I'm about to replace I go for slashes or pipes.

It's interesting you mention inconsistencies across implementations, even more (I assume) going from BSD to GNU ed which unsurprisingly is almost a superset of features with heretical commands such as yank (!).

BSD tends to stick more to POSIX, so issuing just `t` won't duplicate the current line, which I've grown used to. I also like the paging command `z`, which seems to have been adopted by all major implementations. I'm sure Ken would find all of this bloatware!