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Tested on GNU `sed --posix`.
From `info sed`:
`\+'
As `*', but matches one or more. It is a GNU extension.
`\CHAR'
Matches CHAR, where CHAR is one of `$', `*', `.', `[', `\', or `^'.
Note that the only C-like backslash sequences that you can
portably assume to be interpreted are `\n' and `\\'; in particular
`\t' is not portable, and matches a `t' under most implementations
of `sed', rather than a tab character.