EscapingRuby

ESCAPE_MAP   =   { '"' => '\\"', "'" => "\\'" }

def escape_quotes(str)
  if str
    result = str.gsub(/(["'])/u) {|match| ESCAPE_MAP[match] }
  else
    ''
  end
end

string = 'double-quotes "escaped"'
escapedStr = escape_quotes(string)
puts escapedStr
=> double-quotes \'escaped\'