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if ($text =~  /^
                (?:                  # Any amount of:
...
                 )*
                 \]                 # Followed by a close brace
              /xs

my $next;
while ( $next = (extract_bracketed($text,'[]','[^\[]*'))[0] )
...
   print "found matching brackets: *$next*\n";
}
print "found bracket error: $@\n" if $@;