• No sample tests

• No fixed tests

• The description is unclear of what we should do. (Only clear thing is to return a 2-dimensional array)

let match = str.match(new RegExp(town + ':.?(?:\n|$)', 'i'));
In this line you can replace ':.?(?:\n|$)', 'i' with just '.+'

But this RegExp (/\d+(.\d+)/g) is really good