Here is Q.normalize

Q.normalize

/**
 * Normalizes text by converting it to lower case, and
 * replacing all non-accepted characters with underscores.
 * 
 * @static
 * @method normalize
 * @param {String} text
 *  The text to normalize
 * @param {String} replacement
 *  Defaults to '_'. A string to replace one or more unacceptable characters.
 *  You can also change this default using the config Db/normalize/replacement
 * @param {String} characters
 *  Defaults to '/[^A-Za-z0-9]+/'. A regexp characters that are not acceptable.
 *  You can also change this default using the config Db/normalize/characters
 * @param {Number} numChars
 *  The maximum length of a normalized string. Default is 200.
 * @return {String} the normalized string
 */
Q.normalize = function _Q_normalize(text, replacement, characters, numChars) {
	if (!numChars) numChars = 200;
	if (replacement === undefined) replacement = '_';
	characters = characters || new RegExp("[^A-Za-z0-9]+", "g");
	if (text === undefined) {
		debugger; // pause here if debugging
	}
	var result = text.toLowerCase().replace(characters, replacement);
	if (text.length > numChars) {
		result = text.substr(0, numChars-11) + '_' 
				 + Math.abs(text.substr(numChars-11).hashCode());
	}
	return result;
};