How to validate valid characters for latitude and longitude during typing?

I have a text input for latitude typing and another for longitude.

I would like the field to allow typing only the characters valid for latitude and longitude.

I believe the field should only accept numbers, "." and "-", correct?

At first I think that something with regex works, but I do not know what regex would look like:

    // Campo para latitude e longitude;
    $(".latitude, .longitude").on('keypress', function (event) {
        var regex = new RegExp(??????);
        var key = String.fromCharCode(!event.charCode ? event.which : event.charCode);
        if (!regex.test(key)) {             
           event.preventDefault();             
           return false;
        }  
    });