// Copyright (c) 2021 Proton Technologies AG
//
// This file is part of ProtonMail Bridge.
//
// ProtonMail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ProtonMail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

package smtp

import (
	"regexp"
)

//nolint:gochecknoglobals // Used like a constant
var mailFormat = regexp.MustCompile(`.+@.+\..+`)

// looksLikeEmail validates whether the string resembles an email.
//
// Notice that it does this naively by simply checking for the existence
// of a DOT and an AT sign.
func looksLikeEmail(e string) bool {
	return mailFormat.MatchString(e)
}