regexp search nested objects and wrap hits

searchAndWrap.js

var searchAndWrap = function(obj, regex, blacklist){
    var found = false; 
    _(obj).each(function(val, key){
        if(!_.include(blacklist || [], key)){
            if(_.isObject(val)){
                if(searchAndWrap(val, regex, blacklist)){
                    found = true;
                }
            } else {
                val = val.toString();
                obj[key] = val.replace(regex, '<span class="highlight">$1</span>');
                if(obj[key].length != val.length){
                    found = true;
                }
            }
        }
    });
    return found;
};