There is a regression here for a use case that is not explicitly supported by the specification, but is supported by the Arduino IDE 1.x Serial Plotter and previous implementation of this project. That use case is the combination of a trailing delimiter and `\r\n` separator. For example: ```cpp void setup() { Serial.begin(9600); } void loop() { for (byte value = 0; value < 4; value++) { for (byte variableOffset = 0; variableOffset < 3; variableOffset++) { Serial.print(value + variableOffset); Serial.print('\t'); } Serial.println(); } delay(100); } ``` You can see how code that generates data via a `for` loop favors a trailing delimiter, and of course `Serial.println();` is a convenient way to produce a separator. Previously, that sketch produced 3 variables as expected: Arduino IDE 1.8.19:  arduino-serial-plotter-webapp@https://github.com/arduino/arduino-serial-plotter-webapp/commit/eac6d39f3f5156390bc4f9e09cafcccc121248c9 / arduino-serial-plotter-webapp@0.1.0 / Arduino IDE 2.0.0-rc9.3:  After the change made here, it produces 4 variables:  The problem is the `\r` in the `\r\n` separator produced by `Serial.println();` is being treated as a separate value. Previously, that `\r` was consumed by `message.split(/\s/);` (because [it matches `/\s/`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Character_Classes#types)).