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
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