I stumbled on this earlier this week.
:help /\] says:
- To include a literal ']', '^', '-' or '\' in the collection, put a
backslash before it: "[xyz\]]", "[\^xyz]", "[xy\-z]" and "[xyz\\]".
...
For '-' you can also make it the first or last character: "[-xyz]",
"[^-xyz]" or "[xyz-]". For '\' you can also let it be followed by
any character that's not in "^]-\bertn".
I think that last sentence should be:
For '\' you can also let it be followed by any character that's
not in "^]-\bertndoxuU".
Unless there is some reason to exclude the translation codes:
\d123 decimal number of character
\o40 octal number of character up to 0377
\x20 hexadecimal number of character up to 0xff
\u20AC hex. number of multibyte character up to 0xffff
\U1234 hex. number of multibyte character up to 0xffffffff
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