Rinser/plugins/filter_location.js

module.exports = function (item, itemOptions, source) {
  const patt = /(glasgow|london|edinburgh)/ig;
  const result = patt.test(itemOptions.description);
  const resultB = patt.test(itemOptions.title);
  console.log('Location:', (result || resultB === true) ? 'Pass' : 'Reject');

  return (result || resultB === true) ? itemOptions : -1;
};