Follow-up Comment #4, bug #14243 (project findutils):
>From regex(7) (linux man pages collection
http://www.win.tue.nl/~aeb/linux/man/)
-----[cut]----------
Obsolete (``basic'') regular expressions differ in several
respects.
`|', `+', and `?' are ordinary characters and there is no
equivalent
for their functionality. The delimiters for bounds are `\{' and
`\}',
with `{' and `}' by themselves ordinary characters.
-----[cut]----------
So I guess \{ \} are part of basic regular expressions?
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