Underscore ruby strings

def underscore(string)
  return string.to_s unless /[A-Z-]/.match?(string)

  string
    .gsub(/([A-Z]+)(?=[A-Z][a-z])|([a-z\d])(?=[A-Z])/) { ($1 || $2) << '_' }
    .tr('-', '_')
    .downcase
end

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Code snippets in this post are covered by MIT License.

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