Transform object key names with numbers into array

I have this object:

{'categories[0].alias': 'gyms','categories[0].title': 'Gyms','categories[1].alias': 'healthtrainers',       'categories[1].title': 'Trainers','location.display_address[0]': '360 Hampton Dr','location.display_address[1]': 'Venice, CA 90291'}

... and am trying to transform it into this:

{    categories: [        { alias: 'gyms', title: 'Gyms' },        { alias: 'healthtrainers', title: 'Trainers' }    ],    location: {        display_address: [ '360 Hampton Dr', 'Venice, CA 90291' ]    }}

Both of these [1, 2] answers are treating the number as a string and leaving it in the name:

{"categories[0]" : {"alias": "gyms","title": "Gyms"    },"categories[1]": {"alias": "healthtrainers","title": "Trainers"    },"location":{"display_address[0]": "360 Hampton Dr","display_address[1]": "Venice, CA 90291"    }}

I'd like to keep the existing functionality of either answer, but handle keys containing an array position properly.