email-validator/index.js

/* eslint no-useless-escape: "error" */
'use strict';

const tester = /^[-!#$%&'*+\/0-9=?A-Z^_a-z{|}~](\.?[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-?\.?[a-zA-Z0-9])*\.[a-zA-Z](-?[a-zA-Z0-9])+$/; // eslint-disable-line no-useless-escape
// Thanks to:
// http://fightingforalostcause.net/misc/2006/compare-email-regex.php
// http://thedailywtf.com/Articles/Validating_Email_Addresses.aspx
// http://stackoverflow.com/questions/201323/what-is-the-best-regular-expression-for-validating-email-addresses/201378#201378
exports.validate = function (email) {
	if (!email)		{
		return false;
	}

	if (email.length > 254)		{
		return false;
	}

	const valid = tester.test(email);
	if (!valid)		{
		return false;
	}

	// Further checking of some things regex can't handle
	const parts = email.split('@');
	if (parts[0].length > 64)		{
		return false;
	}

	const domainParts = parts[1].split('.');
	if (domainParts.some(function (part) { // eslint-disable-line prefer-arrow-callback
		return part.length > 63;
	}))		{
		return false;
	}

	return true;
};