Ruby の case でワイルドカードのようなのが欲しい ref: http://qiita.com/Ueno1969/items/3e0e5dbd8a464ace369a

file0.rb

_ = Object.new
def _.==(obj)
  true
end


[ ["a", 1], ["a", 2], ["b", 1], ["b", 2], ["c",  1], ["c", 3] ].each do |v|
  pattern = case v
    when ["a", 1 ] then "a,1"
    when ["a", _ ] then "a,*"
    when [_  , 1 ] then "*.1"
    when ["c", 1 ] then "c.1"  # not match
    when [_  , _ ] then "*.*"
    else "Not reach becase of [Any, Any] match all"
  end
  puts "#{v} => #{pattern}"
end

file1.txt

["a", 1] => a,1
["a", 2] => a,*
["b", 1] => *.1
["b", 2] => *.*
["c", 1] => *.1
["c", 3] => *.*