Converts the given string representation of WGS84 coordinates into a standard lat/lng object.

parseWGS84String.js

/**
 * Converts the given string representation of WGS84 coordinates into a standard lat/lng object.
 *
 * @example 60 deg 08.2151' N, 24 deg 25.6136' E
 * @example 43°38'19.39"N,116°14'28.86"W
 * @example +43.6387194°, -116.2413500°
 *
 * For convenience (and to avoid "Cannot read property 'lat' of undefined" errors), always returns an
 * object with the aforementioned keys. For invalid input, the VALUES of the keys will be undefined.
 *
 * @returns https://developers.google.com/maps/documentation/javascript/reference#LatLngLiteral
 *
 * @link https://gist.github.com/jareware/083ecc072bab29130415
 * @author Jarno Rantanen <jarno@jrw.fi>
 * @license Do whatever you want with it
 */
function parseWGS84String(input) {
    return (typeof input === 'string' ? input : '0,0').replace(/deg/gi, '°').split(',').map(function(part) {
        return (part.match(/([+-]?\d+(?:\.\d+)?\s*[°'"]|[nesw])+?/gi) || []).reduce(function(memo, component) {
            var unit = component && component[component.length - 1].toUpperCase();
            var power = '°\'"'.indexOf(unit);
            if (power >= 0) {
                return (memo || 0) + parseFloat(component) / Math.pow(60, power);
            } else if ('SW'.indexOf(unit) >= 0) {
                return (memo || 0) * -1;
            }
            return memo;
        }, null);
    }).reduce(function(memo, part, index) {
        memo[index ? 'lng' : 'lat'] = typeof part === 'number' ? part : undefined;
        return memo;
    }, { lat: undefined, lng: undefined });
}

// UNIT TEST CODE:

[
    // Input to function:                       // Expected output:
    [ "60 deg 08.2151' N, 24 deg 25.6136' E",   { lat: 60.136918333333334, lng: 24.426893333333332 } ],
    [ "60° 08.2151' N, 24° 25.6136' E",         { lat: 60.136918333333334, lng: 24.426893333333332 } ],
    [ "43°38'19.39\"N, 116°14'28.86\"W",        { lat: 43.63871944444445, lng: -116.2413500 } ],
    [ "37° 26' 56.74\" N, 126° 27' 9.05\" E",   { lat: 37.44909444444444, lng: 126.45251388888889 } ],
    [ "+43.6387194°, -116.2413500°",            { lat: 43.6387194, lng: -116.2413500 } ],
    [ "0°, 0°",                                 { lat: 0, lng: 0 } ],
    [ "0, 0",                                   { lat: undefined, lng: undefined } ],
    [ "bla°, bla°",                             { lat: undefined, lng: undefined } ],
    [ "bla",                                    { lat: undefined, lng: undefined } ],
    [ "",                                       { lat: undefined, lng: undefined } ],
    [ false,                                    { lat: undefined, lng: undefined } ],
    [ {},                                       { lat: undefined, lng: undefined } ],
    // Oracle: http://www.earthpoint.us/convert.aspx
].forEach(function(tuple) {
    var output = parseWGS84String(tuple[0]);
    if (output.lat !== tuple[1].lat || output.lng !== tuple[1].lng) {
        console.log('FAIL:', JSON.stringify({
            input: tuple[0],
            expected: tuple[1],
            actual: output
        }, undefined, 4));
    } else {
        console.log('OK:', tuple[0], '=>', output);
    }
});