const chessStory = 'He played the King in a8 and she moved her Queen in c2.';
const regexpCoordinates = /\w\d/g;
console.log(chessStory.match(regexpCoordinates));
// expected output: Array [ 'a8', 'c2']

const moods = 'happy 🙂, confused 😕, sad 😢';
const regexpEmoticons = /[\u{1F600}-\u{1F64F}]/gu;
console.log(moods.match(regexpEmoticons));
// expected output: Array ['🙂', '😕', '😢']