function getUserKeyFromUrl(sUrl) {
		var aMatches = [];

		aMatches = sUrl.match(/People\('(.*)'\)/);

		return aMatches ? aMatches[1] : undefined;
	}
Retrieves a user name from a given request URL.
@param {string} sUrl - the request URL.
@returns {string} the user name or undefined if no user was found.