Fun little regex exercise :)
#!/usr/bin/perl
# http://perlmonks.org/?node_id=1211497
use strict;
use warnings;
my $triangle = <<END;
0-0
1-0 1-1
2-0 2-1 2-2
3-0 3-1 3-2 3-3
4-0 4-1 4-2 4-3 4-4
5-0 5-1 5-2 5-3 5-4 5-5
END
$^R = '3-1'; # clicked node
"@{[ reverse split /\n/, $triangle ]}" =~ / $^R
(?: .*
((??{
my ($row, $col) = split m{\D}, $^R;
$row ? ($row - 1) . '-[' . ($col > 0 && $col - 1) . "$col]" : '(
+*F)'
}))
(?{$1 eq '0-0' and print "$1 $^R\n"; "$1 $^R"})
)+
(*F)
/x;
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