Ruby hash exclude? -

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i have check string in hash

 h = {'a'=>'firsthaha','b'=>'sjdh'}

it's work:

hash.select { |_,v| v.to_s.downcase.include? 'first' }.keys

but how realize vice versa include?

hash.select { |_,v| v.to_s.downcase.????? 'first' }.keys

without using active-support exclude?

hash.select { |_,v| !v.to_s.downcase.include? 'first' }.keys #or  hash.reject { |_,v| v.to_s.downcase.include? 'first' }.keys

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