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[and]must be escaped in both BRE and ERE (otherwise they define a range expression). As to why you get no output when escaping them and using ERE, I think it's a difference in how$is treated between BRE and ERE when it's not the final character of a pattern - see for example Bash sed replace double dollar sign $$ extended regular expressions-Eand-eoptions are two completely different and unrelated things. they are not alternate versions of each other.-etells sed that the next argument is a script to be run.-Etells sed to use extended regular expressions (ERE) instead of sed's default of basic regular expressions (BRE).