Rycochet

	/**
	 * Make sure a number is within a minimum and maximum
	 * @param {number} min
	 * @param {number} num
	 * @param {number} max
	 * @returns {number}
	 */
	Math.range = function(min, num, max) {
		return Math.max(min, Math.min(num, max));
	};

Rycochet

	/**
	 * Split a string into an array of regex matches, or a single result if only a single match
	 * @param {RegExp} r The pattern to check against
	 * @return {Array|string|number} The matches
	 */
	String.prototype.regex = function(r) {
		var a = this.match(r), i, rx;
		if (a) {
			if (r.global) {
				if (/(^|[^\\]|[^\\](\\\\)*)\([^?]/.test(r.source)) { // Try to match "(blah" but not "\(blah" or "(?:blah" - ignore invalid regexp

Rycochet

// Please note this uses my Math.range and String.regex methods
	/**
	 * Convert a hex colour to a rgb/rgba value
	 * @param {string} hex
	 * @param {?number} opacity
	 * @returns {string}
	 */
	function rgba(hex, opacity) {
		var colours = hex.regex(/#?([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})/i).map(function(val) {
			return Math.range(0, parseInt(val, 16), 255);