let emailExpression = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;

function validateEmail(email) {
	return emailExpression.test(email);
}

let excluded = [ //errors that should not be logged
	'Not enough gold',
	'Not enough recruits',
	'Not enough soldiers',
	'Not enough spies',
	'Not enough scientists',
	'Not enough time has passed'
];

const log = (msg, ...args) => {
	if (excluded.indexOf(msg) === -1) {
		console.log(`log ${Date()}: ${msg} (${args.toString()})`);
	}
	return msg;
}

module.exports = {
	validateEmail: validateEmail,
	log: log
};