Parse query string into key/value pairs and return as object

parseQueryString.js

function parseQueryString(url) {
	// parse query string into key/value pairs and return as object
	var query = {}; 
	url = (url || location.search).replace(/^.*\?/, '').replace(/([^\=]+)\=([^\&]*)\&?/g, function(match, key, value) {
		query[key] = decodeURIComponent(value);
		return ''; 
	} ); 
	return query; 
}

Using regex for this is just wrong and will fail in some scenarios.

You'd better off using a tiny reusable module like:
https://github.com/sindresorhus/query-string