docs: function getEmoticons(arr) {
    var nested = arr.map(function (str) {
      return str.match(between);
    });
    
    return flatten(nested)
      .filter(function (el) {
        return el;
      })
      .filter(emoticonsPredicate)
      .map(function (str) {
        return str.slice(1, str.length - 1);
      });
  }