Fun with v8’s Number#toString bug

lolwat.js

var fs = require('fs');
var repl = require('repl');

console.log("Loading dictionary...");
var words = fs.readFileSync("/usr/share/dict/american-english-small", "ascii");

var wordlist = {};

var regex = /[a-z]{4,}/g;
var match;
var word;

console.log("Building dictionary...");
while (match = regex.exec(words)) {
	word = match[0].toLowerCase();
	wordlist[word] = true;
}

var find = function(expr, radix, min) {
	var regex = new RegExp("[a-z]{"+min+",}", "g");
	var num = Number(eval(expr));
	var str = num.toString(radix);
	var matches = str.match(regex);
	if (!matches) return;

	var len = matches.length;
	while (len--) {
		if (wordlist[matches[len]]) {
			console.log("Found: ("+expr+").toString("+radix+").match("+regex+")["+len+"]; // '"+matches[len]+"'");
		}
	}
}

var info = "Use the find() function to scan through all possibilities of hidden words.\nThe arguments are: find(string_eval, radix, minimum_word_length)\n\nIt's best if you loop through as many different numerator/denominator possibilities as you can.\n\tExample: var a = 65535; while (a--) { find ('238/'+a, 33, 6); }\n\nWhen you want to stop it, you might have to kill the running node process with `ps xa | grep node` and then `kill <pid>`.\n\nHave fun!";

console.log("\n"+info);

var c = repl.start("find(eval, radix, min)> ").context;
c.find = find;
c.inc = 0.00000000000001;