gistfile1.js

// JavaScript that solves http://regex.alf.nu/
// Run in Chrome or Firefox console
// Enjoy ;-)
 
// Some people, when confronted with a problem, think 
// “I know, I'll use regular expressions.”
// Now they have two problems.
 
for(var lvl in levels)  {
    var fn = function(lvl) {
        jump(lvl);
        var bad = levels[lvl].bad;
        var bad_w = [];
        for(var i in bad) {
            bad_w.push('^' + bad[i].replace(/\*/g, '\\*') + '$');
        }
        var reg_exp = "^((?!"+ bad_w.join('|') +").)*$";
        document.getElementById("regex").value = reg_exp;
        retest();
        save();
    }
    setTimeout(fn.bind(window, lvl), lvl*1000);
}