ES3Parser.extractString C# (CSharp) Method

        private string extractString(string text) {
        
        // https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Literals#String Literals    
            StringBuilder sb = new StringBuilder(text);
            int startIndex = 1; // Skip initial quote
            int slashIndex = -1;

            while ((slashIndex = sb.ToString().IndexOf(BS, startIndex)) != -1)
            {
                char escapeType = sb[slashIndex + 1];
                switch (escapeType)
                {
                    case '0':
                    case '1':
                    case '2':
                    case '3':
                    case '4':
                    case '5':
                    case '6':
                    case '7':
                    case '8':
                    case '9':
    		  string octalCode = String.Concat(sb[slashIndex+1], sb[slashIndex+2], sb[slashIndex+3]);   
    		  char octalChar = Latin1.GetChars(new byte[] { System.Convert.ToByte(octalCode, 8) } )[0]; 
    		  sb.Remove(slashIndex, 4).Insert(slashIndex, octalChar);         
    		  break;                 
                    case 'x':
    		  string asciiCode = String.Concat(sb[slashIndex+2], sb[slashIndex+3]);   
    		  char asciiChar = Latin1.GetChars(new byte[] { System.Convert.ToByte(asciiCode, 16) } )[0]; 
    		  sb.Remove(slashIndex, 4).Insert(slashIndex, asciiChar);         
    		  break;   	
                    case 'u':
                      char unicodeChar = Convert.ToChar(Int32.Parse(sb[slashIndex + 2].ToString() + sb[slashIndex + 3] + sb[slashIndex+4] + sb[slashIndex+5], System.Globalization.NumberStyles.AllowHexSpecifier));
                      sb.Remove(slashIndex, 6).Insert(slashIndex, unicodeChar); 
                      break;
                    case 'b': sb.Remove(slashIndex, 2).Insert(slashIndex, '\b'); break;
                    case 'f': sb.Remove(slashIndex, 2).Insert(slashIndex, '\f'); break;
                    case 'n': sb.Remove(slashIndex, 2).Insert(slashIndex, '\n'); break;
                    case 'r': sb.Remove(slashIndex, 2).Insert(slashIndex, '\r'); break;
                    case 't': sb.Remove(slashIndex, 2).Insert(slashIndex, '\t'); break;
                    case 'v': sb.Remove(slashIndex, 2).Insert(slashIndex, '\v'); break;
                    case '\'': sb.Remove(slashIndex, 2).Insert(slashIndex, '\''); break;
                    case '"': sb.Remove(slashIndex, 2).Insert(slashIndex, '"'); break;
                    case '\\': sb.Remove(slashIndex, 2).Insert(slashIndex, '\\'); break;
                    case '\r': if (sb[slashIndex+2] == '\n') sb.Remove(slashIndex, 3); else sb.Remove(slashIndex, 2); break;
                    default:  sb.Remove(slashIndex, 2).Insert(slashIndex, escapeType); break;
                }

                startIndex = slashIndex + 1;

            }

            sb.Remove(0, 1);
            sb.Remove(sb.Length - 1, 1);

            return sb.ToString();
        }