Follow-up Comment #5, bug #14243 (project findutils):
> So I guess \{ \} are part of basic regular expressions?
No. In basic regular expressions those would be invalid character escapes.
So that is not a valid POSIX basic regular expression. Because you would not
find those in a valid POSIX BRE implementations such as the GNU RE engine are
free to use them to enable the extended regular expression behavior for those
characters. This is also true of \+ too for example. It is a way to extend
the basic regular expressions in a way compatible with and not conflicting
with POSIX BREs.
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