Node-Red function for extracting colours from a Cheerlights Twitter message.

gistfile1.js

//   Extract colours from Twitter String

var input = msg.payload;
var colours = input.toUpperCase().match(/\b(red|blue|green|purple)\b/ig);
if (colours == null) { return }
//console.log("colours:" + colours);

var pattern = [];
colours.forEach(function(colour) {
  var cc = (colour == "RED") ? "P" : colour.charAt(0);
  
  console.log("Colour:" + colour + ":" + cc);
  
  if (pattern[pattern.length-1] == cc) {
    pattern.push(" ");
  }
  
  pattern.push(cc);
});

if (pattern.length > 0) {
  msg.payload = "CHEER " + pattern.join("");
  msg.input = input;
  return msg;
}