Ruby on Rails

is this fit for your purpose ?

def my_select(array,str)
  array.select{ |sub_array| %r(#{str})=~ sub_array.join}
end

def another_select(array,str)
  array.select{ |sub_array| %r(#{str})=~ sub_array.first.to_s}
end

my_array = [[1,2],[11,2],[23,89]]
while str = gets
  p my_select(my_array,str.chomp)
  p another_select(my_array,str.chomp)
end