gistfile1.js

// ==UserScript==
// @name      delicious fliter
// @namespace http://opera.higeorange.com/
// @include   http://delicious.com/*
// ==/UserScript==

(function() {
    var filter_urls = [
        'http://*.nicovideo.jp/'
    ];

    var filter_urls_regexp = filter_urls.map(
        function(u){
            return new RegExp(u.replace('*', '.*'))
        });

    var posts = document.querySelectorAll('li.post');
    for(var i = 0, h4a, post, l = posts.length; i < l; i++) {
        post = posts[i];
        h4a = post.querySelector('h4 a');
        if(filter_urls_regexp.some(function(r) {
            return r.test(h4a.href);
        })) {
            post.style.display = 'none';
        }
    }


})();