element-web/src/email.ts

/*
Copyright 2024 New Vector Ltd.
Copyright 2023 The Matrix.org Foundation C.I.C.
Copyright 2016 OpenMarket Ltd

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
Please see LICENSE files in the repository root for full details.
*/

// Regexp based on Simpler Version from https://gist.github.com/gregseth/5582254 - matches RFC2822
const EMAIL_ADDRESS_REGEX = new RegExp(
    "^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*" + // localpart
        "@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$",
    "i",
);

export function looksValid(email: string): boolean {
    // short circuit regex with this basic check
    if (email.indexOf("@") < 1) return false;

    return EMAIL_ADDRESS_REGEX.test(email);
}