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use re 'debug';
my $braces = qr/(?<braces>\{ ([^\{\}]* | (?&braces))*? \} )/x;
...
  35: END (0)
anchored "{" at 0 floating "}" at 1..2147483647 (checking floating) mi
+nlen 2 
Freeing REx: "(?<braces>\{ ([^\{\}]* | (?&braces))*? \} )"