[Bug 253893] sed "/^\s*$/d" complains about trailing backslash (\)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253893

--- Comment #18 from Kyle Evans <kevans@freebsd.org> ---
(In reply to crb from comment #17)

It's a one-liner to link sed against libregex instead of libc regex, bringing
it up to parity with grep (i.e., \w, \W, \s, \S, \b, \B) -- the problem is that
it might break a lot of things, it adds repetition operators to BREs that
weren't previously there. If someone bogusly escaped one in the past that
suddenly gets special behavior, we have to fix that.

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