// Email address matcher.

// eslint-disable-next-line no-useless-escape

const matcher =

/[A-Z0-9.!#$%&'*+-/=?^_{|}~]+@[A-Z0-9][A-Z0-9.!#$%&'*+-/=?^_{|}~]*\.[A-Z]{2,}$/i;

/**

* Loosely validate an email address.

* Max length of an email address is 320 characters: 64 for the local part + 1 for the @ +

* 255 for the domain part.

* See https://datatracker.ietf.org/doc/html/rfc5321#section-4.5.3.1.1

*

* Being a bit extra cautious here and limiting the max length to 500 characters, which prevents

* [Regular expression Denial of Service - ReDoS](https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS) attacks

* due to polynomial regular expression used on uncontrolled data.

*

* @param {string} string

* @return {boolean}

*/

function isEmail(value: string): boolean {

if (value.length > 500) return false;

return matcher.test(value);

}

/*

* Exports.

*/

export default isEmail;