How to extract a REGEX query string result array into a Javascript object [duplicate]

Question

Given the result of a regex match to extract an array of query string values resulting in this:

["?firstkey=55555", "&secondKey=Words%That%MayBeEscaped", "&thirdKey=http%3A%2F%2Fs7d9.scene7.com%2Fis%2Fimag…x130%3Fwid%3D322%26layer%3Dcomp%26resMode%3Dsharp"]

What is the proper regex combo to pass into a forEach loop that will create an object of the type:

{firstKey: "55555", secondKey: "Words%That%MayBeEscaped", thirdkey: "http%3A%2F%2Fs7d9.scene7.com%2Fis%2Fimag…x130%3Fwid%3D322%26layer%3Dcomp%26resMode%3Dsharp"}