$_ = "{a}{{b}}{{c}{{d}}}";
($re=$_)=~s/((\{)|(\})|.)/${['(','']}[!$2]\Q$1\E${[')','']}[!$3]/gs;
@$ = (eval{/$re/},$@);
print join"\n",@$ unless $$[-1]=~/unmatched/;

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<code>

In reply to Re: Balancing braces without (??{}) by I0
in thread Balancing braces without (??{}) by tshabet

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