RegExJS.js

(function (scope) {
	"use strict";

	var s = {};

	s.match = function (regex, str, callback) {
		var matches = [];
		var error = null;
		var match = null;
		var index = null;

		if (!regex) {
			callback(error, matches);
			return;
		}

		if (window.Worker) {
			if (s.worker) {
				clearTimeout(s.id);
				s.worker.terminate();
			}

			s.worker = new Worker("js/regExWorker.template.js");

			s.worker.onmessage = function (evt) {
				// When the worker says its loaded start a timer. (For IE 10);
				if (evt.data == "onload") {
					s.id = setTimeout(function () {
						callback("timeout", matches);
						s.worker.terminate();
					}, 250);
				} else {
					matches = evt.data.matches;
					error = evt.data.error;
					clearTimeout(s.id);
					callback(error, matches);
				}
			}
			s.worker.postMessage({regex: regex, str: str});
		} else {
			while (!error) {
				match = regex.exec(str);
				if (!match) { break; }
				if (regex.global && index === regex.lastIndex) {
					error = "infinite";
					break;
				}
				match.end = (index = match.index + match[0].length) - 1;
				match.input = null;
				matches.push(match);
				if (!regex.global) { break; } // or it will become infinite.
			}
			callback(error, matches);
		}
	};

	scope.RegExJS = s;

}(window));