Query Mess - Solution

function solve(args) {
    var regex = /([^=&?]+)=([^=&?]+)/g,
        whitespaceRegex = /(\+|%20)+/g,
        lineIndex,
        currentLine,
        lineObject,
        match,
        key,
        value,
        output,
        i;

    for (lineIndex in args) {
        currentLine = args[lineIndex];
        lineObject = {};

        match = regex.exec(currentLine);

        while (match) {
            key = match[1]
                .replace(whitespaceRegex, ' ')
                .trim();

            value = match[2]
                .replace(whitespaceRegex, ' ')
                .trim();

            if (!lineObject[key]) {
                lineObject[key] = [];
            }

            lineObject[key].push(value);

            match = regex.exec(currentLine);
        }

        output = '';

        for (i in lineObject) {
            output += i + '=[' + lineObject[i].join(', ') + ']';
        }

        console.log(output);
    }
}

//solve([
//    'foo=%20foo&value=+val&foo+=5+%20+203',
//    'foo=poo%20&value=valley&dog=wow+',
//    'url=https://softuni.bg/trainings/coursesinstances/details/1070',
//    'https://softuni.bg/trainings.asp?trainer=nakov&course=oop&course=php'
//]);