Dear Maintainer,
In these examples from "info sed", `-E' is not used for anything:
$ printf '%s\n' a1 a2 a3 | sed -E '/1/bx ; s/a/z/ ; :x ; y/123/456/'
$ printf '%s\n' a1 a2 a3 | sed -E '/1/!s/a/z/ ; y/123/456/'
In this example from "info sed", `g' is not used for anything:
sed ':x ; /=$/ { N ; s/=\n//g ; bx }' jaques.txt