what does it mean if the empty string can be repeated n times?

It means "We kept the heading short, feel free to split hairs." The single line below that heading reads: An empty lower bound is now accepted for regular expression quantifiers, like {,3}.

But I'm rather expecting Perl not reading the curlies as metas.

Correct. A open curly was interpreted literally in regular expressions in a lot of places in old Perl versions. Since Perl 5.26 some of these uses were forbidden, and Perl 5.28 made some of these uses non-fatal again. Relevant reading:

so {,3} is the same like {0,3} or {1,3} ?

Same as {0,3}.

In reply to Re^3: Perl 5.34 is released (bad code example) by haj
in thread Perl 5.34 is released by 1nickt

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