class RuboCop::Cop::Style::ExactRegexpMatch

def on_send(node)
  return unless (receiver = node.receiver)
  return unless (regexp = exact_regexp_match(node))
  return unless (parsed_regexp = parse_regexp(regexp))
  return unless exact_match_pattern?(parsed_regexp)
  prefer = "#{receiver.source} #{new_method(node)} '#{parsed_regexp[1].text}'"
  add_offense(node, message: format(MSG, prefer: prefer)) do |corrector|
    corrector.replace(node, prefer)
  end
end