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skanev/validate_egn.rb

Created August 28, 2009 14:37
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validate_egn.rb
def egn_valid?
egn =~ /^(\d{2})(\d{2})(\d{2})\d{3}(\d)$/ and
egn.each_char[0...9].zip([2, 4, 8, 5, 10, 9, 7, 3, 6]).sum { |d, w| d.to_i * w } % 11 % 10 == $4.to_i and
Date.valid_civil?($1.to_i, $2.to_i % 20, $3.to_i) and
$2.to_i / 20 <= 2
end
# Алгоритъм от тук: http://www.grao.bg/esgraon.html
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