class RuboCop::Cop::Style::RedundantStringEscape

def delimiter?(node, char)
  return false if heredoc?(node)
  if literal_in_interpolated_or_multiline_string?(node) || percent_array_literal?(node)
    return delimiter?(node.parent, char)
  end
  return true unless node.loc.begin
  delimiters = [node.loc.begin.source[-1], node.loc.end.source[0]]
  delimiters.include?(char)
end