Javascript Object Key Detection

detect.js

function detect(obj, attr, exact) {
    var results = [],
        re = new RegExp(attr, 'i');

    // helper function for the recursion
    function detectHelper(obj, attr, exact, path, results) {
        for (var a in obj) {
            // sanity check
            if (!obj.hasOwnProperty(a))
                continue;
            // check the current key
            if (!exact && re.test(a) || (exact && a == attr))
                results.push(path + a);
            // recusrively check values
            if (obj[a] && obj[a].constructor.toString().indexOf('Object') != -1)
                detectHelper(obj[a], attr, exact, path + a + '/', results);
        }
    }

    detectHelper(obj, attr, exact, '/', results);

    try {
        for (var i = 0; i < results.length; ++i)
            console.log(results[i]);
    } catch(e) { /* do nothing */}
    // return results;
}

Object.prototype.detect = function(attr, exact) {
    var results = [],
        re = new RegExp(attr, 'i');

    // helper function for the recursion
    function detectHelper(obj, attr, exact, path, results) {
        for (a in obj) {
            // sanity check
            if (!obj.hasOwnProperty(a))
                continue;
            // check the current key
            if (!exact && re.test(a) || (exact && a == attr))
                results.push(path + a);
            // recusrively check values
            if (obj[a] && obj[a].constructor.toString().indexOf('Object') != -1)
                detectHelper(obj[a], attr, exact, path + a + '/', results);
        }
    }

    detectHelper(this, attr, exact, '/', results);

    try {
        for (var i = 0; i < results.length; ++i)
            console.log(results[i]);
    } catch(e) { /* do nothing */}
    // return results;
}