module ActiveSupport::JSON::Encoding

def escape(string)
  string = string.encode(::Encoding::UTF_8, :undef => :replace).force_encoding(::Encoding::BINARY)
  json = string.gsub(escape_regex) { |s| ESCAPED_CHARS[s] }
  json = %("#{json}")
  json.force_encoding(::Encoding::UTF_8)
  json
end

def escape_html_entities_in_json=(value)
  self.escape_regex = \
    if @escape_html_entities_in_json = value
      /[\x00-\x1F"\\><&]/
    else
      /[\x00-\x1F"\\]/
    end
end