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1 | p1=v1,p2=v2 | p3=v3,p4=v4

%hash = (
1 => [
...
]
);

my @conditioin = split(/\|/);
%{$mapping_rule{$condition[0]}}->[0]} = map {split (/=/, $_)} = map {s
+plit (/\,/, $condition[1])};
...
        }
    }
}